David Conley allegedly broke into his former home in Houston on Saturday, where his ex-girlfriend lived with her new husband and six children.
He handcuffed all eight of them and shot them, one by one, in the head, police said. One of the victims was Conley's son.
Police arrived at the Harris County home after Earl Yanske, the brother of Conley's ex Valerie Jackson, told them about an alarming phone conversation he'd just had with Conley.
Yanske was worried because he'd heard from another family member that Conley showed up at Jackson's home. He detailed the chilling phone call with The Houson Chronicle: