Investigators Lastra, 32, strangled Rivera in her Frystown, Pa. home.
Authorities say Rivera's sister was Lastra's ex-girlfriend and they had recently broken up.
Police say Lastra was later pulled over for a traffic violation in Harrisburg, but fled and foot and stole a vehicle.
That vehicle was later found abandoned in Baltimore.
On Thursday, police say Lastra was arrested driving a stolen car in Virginia.
Inevstigators from the Pennsylvania State Police will be traveling to Virginia.
You can get the latest crime statistics from the Philadelphia Police by CLICKING HERE for the force's crime data mapping site.
