Four teenagers have been charged with involuntary manslaughter in connection with the death of Griffen Kramer, a senior quarterback at Thousand Oaks High School and son of former NFL quarterback Erik Kramer, according to ESPNLosAngeles.com.

Kramer, 18, was found dead at a friend's home in Agoura Hills, California on Oct. 30. from what is suspected to be alcohol poisoning, according to NBC Los Angeles.

Sheriff's investigators arrested David Nernberg, 19, and Corey Baumann, 19, of Agoura Hills and charged them with involuntary manslaughter and possession of a controlled substance by. Baumann was also charged with possession of a controlled substance for sale.

Sheriff's deputies arrested two 17-year-olds who were charged with involuntary manslaughter and possession of a controlled substance. One is a boy from Oak Park who being held at Sylmar Juvenile Hall without bail. The other is a girl from Westlake Village who was taken into protective custody by the Department of Family and Child Services Response Team because of deplorable living conditions.

Nernberg and Baumann were released on Thursday on $125,000 bail each, according to reports.

Sgt. Barry Hall of the Sheriff's Department Homicide Bureau said Kramer overdosed on heroin, according to ESPNLosAngeles.com.

We're still waiting for toxicology results to determine the ultimate cause of death, he said.

Hall also said that on Oct. 29, Kramer, Nernberg and a 17-year-old juvenile met in Sumac Park in Agoura Hills and drove to a nearby cul-de-sac where Kramer injected some heroin.

KTLA-TV in Los Angeles reported that authorities said at some point after injecting the heroin, Kramer then fell unconscious.

Rather than seeking immediate medical attention, (Nernberg) called some other heroin users and asked them what to do, Hall said. They didn't want any part of it, so he drove him [Kramer] to his home.

Hall said that Nernberg believed Kramer was asleep and, thus, left him in his house. Nernberg returned around 12:30 a.m. to check on Kramer and Hall said Nernberg believed Kramer was still asleep.

He woke up the following morning and called 911 because Griffen was unresponsive, he said.

Detectives are investigating whether Baumann supplied the heroin to Kramer and Nernberg and what role the two 17-year-old juveniles played in Kramer's death, Hall said.

Ironically, Nernberg played with Kramer on the Agoura High football team for two seasons.

Kramer attended Agoura High School in his freshman year and for part of his sophomore year. He left the school to enter a drug rehabilitation program for substance abuse before transferring to Thousand Oaks High School for his senior year, according to the Ventura County Star.

Kramer told the Star before leaving Agoura High that If it wasn't for football, I might have fallen into the rabbit hole and not made it back.

Hall said to ESPNLosAngeles.com that he was shocked to discover Kramer died of a heroin overdose because heroin-related deaths in the part of Los Angeles County where he works are pretty rare.

I don't know what to say, Hall said. I want to think it is not widespread. Obviously there is something out there. I hope it goes away. It's like playing with fire.

When the news broke of Kramer's death, the Chicago Bears tweeted its condolence to the Kramer family.

LM: Very, very sad news: Ex #Bears QB Erik Kramer's 18-year-old son, Griffen, passed away Sunday. Our thoughts & prayers are with u, Erik, the team wrote.

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