A death penalty trial began Monday in Dauphin County.
Harrisburg police said Miguel Figueroa-Novoa shot and killed his 19-year-old girlfriend, Yarelis Berrios, just a few days before Christmas in 2010. Police said he then shot Berrios' mother multiple times before attempting to take his own life.
Police said it all happened inside the home Figueroa-Novoa and Berrios shared at the Ivey Lane apartments. Police said the two lived with their toddler son, who was not hurt. Investigators said Berrios' 9-year-old niece witnessed the shootings. She escaped and ran for help.
If convicted of first-degree murder, prosecutors said they will seek the death penalty against Figueroa-Novoa.