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ESCONDIDO, Calif. – Escondido police announced Tuesday the arrest of a San Marcos man in connection with the death of a woman found inside a car parked on an Interstate 15 onramp.

“This case began as a suspicious death investigation which was later determined to be a homicide,” Escondido Police Department Lt. Justin Murphy.

Las Vegas police took 38-year-old Edward Andrew Long into custody during a traffic stop on June 21. Police did not go into detail on what led Vegas police to pull him over.

“On Tuesday, June 21 Las Vegas Metropolitan Police officer made a traffic enforcement stop on a vehicle occupied by Edward Long. Long was arrested in Las Vegas on murder charges in connection with the death of Elizabeth Perez,” said Escondido Police Department Lt. Justin Murphy.

Escondido police named Long a person of interest in the death of Fontana resident Elizabeth Antoinette Perez, 38, who was found with a fatal gunshot wound to the head on June 13.

Perez was sitting in the driver's seat of a black Mercury Sable with shattered driver and passenger side windows. It was parked on the connector to I-15 from El Norte Parkway in Escondido.

Long and Perez had been in a relationship, police said. Detectives seized some items from his house as a part of the death investigation. After he was arrested in Nevada, police served additional search warrants.

“Even though an arrest has been made, there’s still a significant amount of work that needs to be completed. Specific details about this investigation including evidence seized, existence of any statements, and possible motives will not be released at this time,” Lt. Murphy said.

Long, who has prior criminal history, remains in a Las Vegas jail Tuesday and waived extradition to San Diego County. He faces up to 25 years to life in prison if convicted of murder.

Anyone with additional information was asked to call police at 760-839-4722, or submit an anonymous tip by calling 760-743-8477.