23-year-old Brett Cronin was arrested after a 13-year-old boy was found dead is a Woodland Hills home on Wednesday morning. Cronin was arrested that night for allegedly shooting himself up, then shooting the boy up with a fatal dose of heroin. The boy was spending the night at a friend's house, and Cronin is the friend's older brother. 

Authorities say the boy began convulsing, and Cronin panicked, but did not call for assistance. The boy had no track marks on his body, and Cronin's reason for injecting the boy is unknown. Still, he was charged with murder and is being held on $1 million bail. 

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[via The Huffington Post]