David Bonola faces charges of second-degree murder, first-degree criminal tampering and fourth-degree criminal possession of a weapon
Bonola made a confession to police after he was arrested, a law enforcement official previously said. At Thursday's news conference, Essig said Bonola had made "incriminating statements."
Based on the preliminary investigation, authorities believe Gaal and Bonola, a handyman employed by her family, had an intimate relationship, police said at the news conference.
Investigators have determined Gaal attended a show Friday night and returned to her home in the Forest Hills neighborhood around 12:20 a.m. Saturday, Essig told reporters.
Bonola arrived at the home soon after, Essig said. He was either let inside the home or used a spare key.