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.
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