Robert Vicosa, 41, Tia Bynum, 35, and his two children, Aaminah, 6, and Giana, 7, all died from gunshot wounds, Maryland State Police said in a release.
Vicosa was a former Baltimore County police officer and Bynum was a current Baltimore County police sergeant, FOX 5 in Washington, D.C. reported.
The two were wanted in a Pennsylvania crime spree, FOX 5 reported.
Pennsylvania State Police attempted to stop the SUV, which matched the suspect vehicle description, Thursday afternoon, but the driver went across the state line into Maryland, striking a culvert, skidding off the road and coming to a stop in a grassy area in Washington County.
"Our crisis negotiation team made several attempts to contact the occupants of the vehicle," Elena Russo, spokeswoman for Maryland State Police, told reporters. "After receiving no response and low visibility inside the vehicle because of a thick layer of smoke that was contained in the interior of the vehicle, police made entry into the passenger side."
Maryland troopers found all four unresponsive in the SUV, Bynum in the driver’s seat and the other three in the back.
Bynum, Vicosa and one of the children were pronounced dead at the scene. The other child was pronounced dead at a hospital. It wasn't clear who shot the children.
Vicosa was accused of kidnapping his daughters after sexually assaulting his ex-wife in York County, Pennsylvania, according to FOX 5.