ROXBURY, Mass. (WHDH) -- A man was fatally stabbed in the neck in Roxbury on Wednesday.

Two young men got into a fight just as they got off an MBTA bus and the victim was stabbed in the neck, police said.

Police said the man was stabbed and stumbled across the street to the Dudley Square Library where he collapsed. The victim was transported to Boston Medical Center where he was pronounced dead.

It was a gruesome scene; cars were splattered with blood and evidence markers charted the victim’s trail.

“They got in an altercation on the bus,” said Windy Seven, a witness. “Somebody stepped on somebody’s shoes.”

Witnesses said two men got off the bus and one grabbed the other by the collar of his shirt and started his neck. Family members have identified the victim as 23-year-old Rashad Barnes, though police have yet to identify the victim.

"He did tell me a while ago about stepping on somebody's sneakers and somebody got mad. Thought he just brushed it off but I guess they came out for revenge. Killing people over sneakers is stupid," said Chris Clark, the victim's friend.

“Somebody was calling for some help and I looked around and this gentleman was being accosted by another man. I thought they were just fighting,” Seven said.

Witnesses said the victim stumbled across the street and collapsed by a group playing chess outside the library.

“The gentleman sat down at my table and was bleeding profusely. I just asked him who did it and he said he didn’t know,” Seven said.

Police closed off a large and busy section of Warren Street as they continued to investigate the stabbing.

Police have not released the identity of the victim. Family members of the victim said at a vigil Wednesday night he was just on his way to work.   

Police are searching for the suspect.