BROADVIEW HEIGHTS, Ohio -- The multi-state search continues for a suspect who gunned down a doctor on the Ohio Turnpike.

Dr. Gulam Moonda, 65, of Hermitage, Pa., was shot and killed Friday night along the side of the turnpike in Broadview Heights.

Moonda, a urologist at Sharon Regional Health System in Sharon, Pa., was with his wife and his mother-in-law. They were headed to Toledo when they pulled over to switch drivers.

SLIDESHOW: Doctor Shot In Head On Turnpike

Officials said that’s when the suspect, who was possibly driving a dark mini van, pulled up behind Moonda's Jaguar and demanded money.

Police said the suspect shot the doctor in the head after taking his wallet.

Moonda was pronounced dead by a doctor aboard a medical helicopter.

If you saw the doctor's Jaguar pull over or the vehicle pull up behind, give the Ohio Highway Patrol a call at (440) 234-2096.

Dr. Moonda

Moonda came to the United States in 1970 from India, WEWS reported.

To his patients, he was a man who mixed modern medicine with old-fashioned care and compassion.

Doctors and friends at Sharon Regional Health System offered insight about the slain urologist.

"They were allowed to call him anytime at home, he always used to tell them call me anytime any problems at home and they used to do that,” said Dr. Ravi Sachdva, Moonda's friend.

Dr. Peter Daloni, another one of Moonda's friends, said, "I unfortunately have had to see several patients this morning who were in the hospital and they were quite shook up also talked to some patients on this morning and there's quite a loss and quite a gap that we're going to have to fill."

Moonda continued to have close ties to his family in India.

"He took care of his family and brothers in India, his sisters in India, his in-laws -- Donna's mother (and) father. He was a really quiet gentle man we will really miss him," said Dr. Iftikhar Chatha,