His mother, according to FOX station KTLA, was in the apartment at the time.
Haim was most noted for his role in The Lost Boys, his friendship with fellow child actor Corey Feldman, not to mention his contribution to countless other movies.
R.I.P. Corey Haim
1971-2010
Update: Corey Feldman on Haim's tragedy.
I was awakened at 8:30 this morning by my brother and sister knocking on my bedroom door. They informed me of the loss of my brother Corey Haim. My eyes weren’t even open all the way when the tears started streaming down my face.
I am so sorry for Corey, his mother Judy, his family, my family, all of our fans, and of course my son who I will have to find a way to explain this to when he gets home from school. This is a tragic loss of a wonderful,beautiful,tormented soul, who will always be my brother,family, and best friend.
We must all take this as a lesson in how we treat the people we share this world with while they are still here to make a difference. Please respect our families as we struggle and grieve through this difficult time. I hope the art Corey has left behind will be remembered as the passion of that for which he truly lived. ~ Corey
