A man was convicted Thursday of the random mutilation killings of a musician and his family, a verdict that took just 30 minutes to reach and could bring the death penalty.

Lawyers for Ricky Jovan Gray, 29, presented no witnesses and acknowledged he confessed to the New Year's Day slayings of musician Bryan Harvey, 49, his wife, Kathryn, 39, and daughters Stella, 9, and Ruby, 4.

Seeing photographs and hearing details of how they died — bound, beaten and stabbed, with their throats cut, in basement of their burning home — left one juror in tears and others looking shaken. They could recommend that Gray be executed after the trial's penalty phase.

According to the confession to Philadelphia police after his arrest, Gray and two accomplices were looking for a house to rob on New Year's Day when they noticed the Harveys' front door was open.

"It was an open door — a front door — that brought Ricky Gray into their home," prosecutor Michael Herring told jurors. "He came into that house and he invaded what was clearly a household of love and peace. ... What Mr. Gray brought was nothing but sadness, despair and destruction."