A man was shot to death Monday night while walking his dog, the second dog-walking homicide in West Philadelphia within the past week.

The shooting occurred around 7:25 p.m. Monday evening on the 300 block of Horton Street, ABC reported, adding that investigators said the victim was shot once in the head though it is unclear if he was specifically targeted.

"When neighbors saw him lying on the sidewalk, he was still holding the leash in his hands, and the dog was attached," Philadelphia Police Chief Inspector Scott Small said to ABC.

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The victim was taken to Penn Presbyterian Trauma Center, where he was pronounced dead, NBC said, also stating that the dog was not harmed.

This is the second dog-walking homicide in West Philadelphia in the past week, NBC reported, adding that Mark Marshall was killed about three miles away last Wednesday while walking two Chihuahuas

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No arrests have been made in either case, and so far police do not have a suspect or motive, according to ABC.