The search to find “Glee” TV show star Naya Rivera in a Southern California lake resumed on Sunday, authorities said.

The Ventura County Sheriff’s Office said last Thursday that they believe Rivera, 33, drowned in Lake Piru, northwest of Los Angeles. Her 4-year-old son was discovered alone in a rented boat.

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A search-and-rescue boat continues looking for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

The search to find “Glee” TV show star Naya Rivera in a Southern California lake resumed on Sunday, authorities said.

Sgt. Carl Patterson, of the Ventura County Sheriff's Department, continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Rivera began acting at a young age, but she rose to national attention playing a lesbian teen on “Glee,” which aired from 2009 until 2015 on Fox.

Ventura County Sheriff's Department Senior Deputy Larry Hanson, second from right, and Capt. Jeremy Paris, far right, continue the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Ventura County Sheriff's Department Senior Deputy Larry Hanson, second from right, and Capt. Jeremy Paris, far right, continue the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Sgt. Tim Lohman, left, and Capt. Jeremy Paris of the Ventura County Sheriff's Department, continue the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Sgt. Tim Lohman, left, and Capt. Jeremy Paris of the Ventura County Sheriff's Department, continue the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Capt. Jeremy Paris of the search and rescue unit of the Ventura County Sheriff's Department continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Capt. Jeremy Paris of the search and rescue unit of the Ventura County Sheriff's Department continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Sgt. Carl Patterson, of the Ventura County Sheriff's Department, continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Sgt. Carl Patterson, of the Ventura County Sheriff's Department, continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

The boy, who was found asleep and wearing a life vest late Wednesday afternoon, told investigators that he and his mother went swimming and he got back on the boat, but “his mom never made it out of the water,” Sheriff’s Sgt. Kevin Donoghue said.

A search-and-rescue boat continues looking for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

A search-and-rescue boat continues looking for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Rivera began acting at a young age, but she rose to national attention playing a lesbian teen on “Glee,” which aired from 2009 until 2015 on Fox.

Sgt. Carl Patterson, of the Ventura County Sheriff's Department, continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Sgt. Carl Patterson, of the Ventura County Sheriff's Department, continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Ventura County Sheriff's Department Senior Deputy Larry Hanson, second from right, and Capt. Jeremy Paris, far right, continue the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Ventura County Sheriff's Department Senior Deputy Larry Hanson, second from right, and Capt. Jeremy Paris, far right, continue the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Sgt. Tim Lohman, left, and Capt. Jeremy Paris of the Ventura County Sheriff's Department, continue the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Sgt. Tim Lohman, left, and Capt. Jeremy Paris of the Ventura County Sheriff's Department, continue the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Capt. Jeremy Paris of the search and rescue unit of the Ventura County Sheriff's Department continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Capt. Jeremy Paris of the search and rescue unit of the Ventura County Sheriff's Department continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Sgt. Carl Patterson, of the Ventura County Sheriff's Department, continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)

Sgt. Carl Patterson, of the Ventura County Sheriff's Department, continues the search for missing actress Naya Rivera at Lake Piru, Friday, July 10, 2020, in Los Padres National Forest, Calif., about 55 miles (90 kilometers) northwest of Los Angeles. Authorities said that they believe the "Glee" star drowned in the lake Wednesday, but they are continuing the search for her two days after her 4-year-old son was found alone in a rented boat. (AP PhotoChris Pizzello)