Naya Rivera, best known for starring on the television show “Glee,” tragically drowned back in July at the age of 33 while she was out boating on Lake Piru in California with her 4 year-old son. Now, tragic details about her final moments have been revealed.

The Ventura County Medical Examiner just released a report about Rivera’s last moments before she tragically died. Fox News reported that her 4 year-old son Josey said that prior to her drowning, he and his mother “counted ‘1, 2, 3’ and then jumped off the boat together.”

A short time after that, Rivera told her son “to get back on to the boat.”

“She helped him onto the boat and he then heard [Rivera] yell ‘help’ and she put her arm in the air. She then disappeared into the water,” the report stated. It added that Rivera “was considered to be a good swimmer,” and according to a lake attendant who rented her the boat, Rivera had declined a life vest, but he included one for her anyway.

A toxicology report revealed that Rivera had a small amount of prescribed amphetamines in her system, but it did not identify physical conditions or drugs as factors in her death. The actress had previously dealt with vertigo problems and had recently suffered from a sinus infection.

The toxicology report concluded that Rivera had small, trace therapeutic amounts of the anti-anxiety drug diazepam and the appetite suppressant phentermine in her system. An autopsy also found that she had “no known history of suicidal ideation or attempt.”

Rivera’s body was found on July 13, five days after she went missing while boating with her son. Officials said her body was probably trapped in thick vegetation underwater for several days before floating to the top.

Police said after her death that they believe Rivera used the last bit of strength that she had to save her son’s life after they went for a swim and things took a turn for the worse.

“We know from speaking with her son that he and Naya swam in the lake together at some point during their journey,” Sheriff Bill Ayub told reporters. “It was during that time that her son described being helped into the boat by Naya – who boosted him onto the deck from behind. He told investigators that he looked back and saw her disappear under the water.”

“She must have mustered enough energy to get her son back on the boat, but not enough to save herself,” he later added.