D.C. police are looking for the man responsible in the stabbing death of a father of seven and longtime cab driver in the District.

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Detectives were at the headquarters of Gold Star Cab Company Monday searching the taxi Hayes Dennis owned and talking with his co-workers.

"It's tough...very tough," Pitram Ghuman, Dennis' boss at Gold Star, said. 

Dennis drove a cab for 20 years and still drove on occasion. But four years ago, he was promoted to manager of the repair shop. On Thursday night, Dennis was stabbed to death in a robbery attempt outside the cab company's headquarters, a block away from Nationals Park.

Dennis' brother-in-law, Osei Antwi, said, "We are trying to see what we can do for his kids. He's a man who helped people."

Antwi said the 60-year-old Ghana native leaves behind a wife and seven children, ranging in age from four to 20. Those who knew him say Dennis was an unbelievably friendly and generous man.

"He was a nice guy, friendly, always helpful. It's sad to hear about this," added friend Wahid Uddin.

Police and witnesses said on July 19 at 7 p.m., a man walked into Gold Star headquarters and asked for a glass of water. Dennis let him in, so he could take water from the cooler. On his way out, the suspect pulled a knife and demanded money.

"He gave him money, and he tried to follow him," Ghuman explained.

Witnesses say the two were just outside the building when the suspect turned and stabbed Dennis and ran away.

Police say Dennis was unconscious when officers arrived. He was taken to the hospital, where he died from his stab wound.

The Associated Press contributed to this report.