EMBED >More News Videos Investigators are seeking clues in the shooting death of a man in southeast Houston

3rdWard residents look on as police continue investigating. Man shot, killed off Scott St #abc13 pic.twitter.com/8Ml3GdGpMO — Courtney Fischer (@CourtneyABC13) July 20, 2016

Murder scene still taped off @ Scott & Rosalie. #abc13 pic.twitter.com/ha9crqFwyb — Courtney Fischer (@CourtneyABC13) July 20, 2016

UPDATE: 2 in custody tied to 3rdWard shooting. HPD: driver of silver truck admitted to "being involved" #abc13 pic.twitter.com/LBocG1PWKk — Courtney Fischer (@CourtneyABC13) July 20, 2016

HOUSTON (KTRK) -- Houston police say it's a tragic case of mistaken identity, when a 33-year-old man was shot and killed in the Third Ward Wednesday morning.Two people are now in custody after the shooting on Napoleon Street and Rosalie Street.Crime scene tape blocked the intersection of Rosalie and Napoleon, a few blocks from University of Houston's campus.Neighbors, friends and family took in the scene many described as "all too familiar" as police investigated.It was just before 4am when shots rang out.Friends identified the man killed as Demarcus Tucker. He died before paramedics arrived."The violence has got to stop. The crime has got to stop," said neighbor, Tekia Wilker.Police say Tucker was not the killer's intended target."There was a possibility this was a mistaken identity," said HPD, Thomas Simmons.Investigators believe the shooter was after someone he made a drug deal with hours earlier, not Tucker."There was some kind of drug transaction that went on that didn't happen quite the way it was supposed to happen," Simmons said. "Very tragic scene, unfortunately."People in the Third Ward say they're not surprised to hear about another deadly shooting."They are killing all the children," said Glen Olezene, who lives nearby."It doesn't make sense. Everybody fighting against each other instead of helping each other," said Wilker.But how much can one family take?Tucker's younger brother was killed two weeks earlier. Daquarius Tucker, 19, was one of five people shot on July 4th during a block party in the Fourth Ward. So far, no arrests have been made in that case.One man was arrested this morning, less than a mile from where Demarcus Tucker was gunned down.Originally, two people were taken into custody but police say it's likely only one will be charged with Tucker's death. That man's name has not been released yet.We're following this story on Eyewitness News. Watch for updates on air, online and on our mobile news app.