HOUSTON (KTRK) -- Houston police have arrested a man who allegedly confessed to fatally stabbing a 14-year-old boy in southwest Houston on Monday.Christopher Bert Taylor, 52, was arrested Wednesday without incident after investigators received a Crime Stoppers tip, according to police. Joseph Aguirre-Flores was stabbed multiple times outside a check cashing place at about 11pm and staggered toward Beechnut Street and collapsed. It's a scene Chanz Larry keeps replaying over and over."I was holding him, 'Come on, man. Keep breathing. You're doing so good. You're doing so good. Are you hurt? You okay? You okay?'" Larry said, while kneeling down and showing how he held the boy's head above the ground.Larry found Aguirre-Flores in the middle of the street while he was on his way home from the grocery store. The teen had been stabbed multiple times."'Just think about your brother and sister,'" Larry instructed him. "I was like, 'They're almost here. Just hang in there. You're doing good.'"Witnesses told police they heard a scream and saw the boy running. Surveillance cameras captured him as he struggled to survive. Police say Taylor is the sole suspect in his murder. Taylor has a lengthy rap sheet, including a DWI and five convictions for drug possession and four theft cases.The arrest is little comfort to Larry."He's ... old. 50's. He's lived. That kid was 14, you know. He didn't get a chance to live," Larry said.Larry never met the boy his family called Jose, but he will never forget him."Although I didn't know him, I feel like I knew him at one of the most important and critical times of his life."