FORT WAYNE, Ind. (WANE)---The 22-year-old man who handed off the gun to his best friend to shoot a 19-year-old man they met for a drug deal on South Lafayette Street alley was found guilty Friday of murder, felony murder, attempted robbery and arson. Dimitrius Walker was also found guilty of using a firearm to commit a crime which can add up to 20 years on a sentence. Once Walker heard the verdict, he hung his head down and covered his face with his hands. He could have been weeping over a future sentence that will take him away from his family and a very young daughter who sat outside at one point with her mother. Walker's co-defendant, Nasir Owens, now 19, in the Sept. 26, 2023 shooting death was convicted of murder and arson in June and sentenced to 77 years in prison. Owens received 60 years for murder, two years for arson and 15 years for using a firearm in the commission of offense. Walker was convicted of additional counts because of his conversations with a cellmate that detailed the homicide. Those conversations included Owens but would be considered hearsay. Walker's lead attorney, David Felts, told the jury that all the evidence was circumstantial and that nothing truly tied him to the three crime scenes - first in the alley behind the 4100 block of South Lafayette where Austin Seiman was shot, dragged to the grass and left for about a half hour before the duo returned to put him in a bag in Walker's mother's Hyundai Sonata. Seiman was shot nine times, according to testimony, but the shell casings from the alley shooting had been removed. The gun was never found. Cell phone mapping picked up the pair at the Tecumseh Bridge over the Maumee River close to downtown where they tried to submerge Seiman's body, but it didn't work. Seiman's body was found near the ramp by a kayaker a couple of days later. An eyewitness saw Seiman physically assaulted by the two men and heard three to four gunshots. Although he couldn't speak English well, he told investigators that he told someone coming to visit him to avoid the alley because he believed there was a body there. Seiman's girlfriend told investigators that Austin had gone "to make a play," street lingo for a drug deal, according to court documents. Florida woman messages investigator instead of drug dealer by mistake In this same two-and-a half hour period from 10 p.m. on Sept. 26 to 12:30 a.m. the next day, surveillance cameras and cell phone mapping tracked Walker and Owens to Owens' home in the 5300 block of Standish Drive and then to the 3100 block of Smith Street where the 2010 blue Hyundai Sonata was doused with gasoline and set afire. The explosions woke up the terrified neighbors who called police. The explosions, although grainy, can be seen on Ring doorbell video. Although cell texts linked Owens, whose handle was Cbw Luh Flint or just "Flint," to the victim as they arranged the alley drug deal, video showed two tall, thin men acting in concert, from the beating they delivered to Seiman in the alley to Walker's mother's home on Standish Drive where the two tried to remove evidence from the license plate to the eventual car fire on Smith Street. Walker also confided the crime to a fellow inmate at the Allen County Jail. A.M. was an important part of the trial and was quoted extensively in closing arguments. Yes, Chief Deputy Prosecutor Tom Chaille admitted that A.M., who testified Thursday, had an extensive criminal past, but he obtained details from Walker that wouldn't have been known otherwise. One of those details was the heartbreaking vision of Seiman "begging for his life." "How would A.M. know that if Dimitrius didn't tell him?" Chief Counsel Tesa Helge asked. Felts thought otherwise. He found it unusual that a 20-year old Black male "would be so open" with a white guy in his late 40s, especially at a place like the jail with so many people within earshot. Helge said the two panicked, piling one crime on after the other after Seiman was shot. But for what? "Why did they need to do this? They took his life over nothing, just a small amount of drugs," Helge said. Walker's sentencing is scheduled for Feb. 7 in front of the presiding judge, Allen Superior Court Judge Fran Gull.