The Des Moines Police Department has released new information in 18-year-old Abdullahi "Abdi" Sharif's death. Sharif was last seen alive Jan. 17 when he left the Target store at Merle Hay Mall. Multiple months of searching followed. On May 2, authorities found Sharif's body in the Des Moines River. This week, the Des Moines Police Department announced they have concluded the investigation into Sharif's death. Investigators learned early on from his family that Sharif had expressed thoughts of hurting himself. "Detectives also learned that Sharif had been secretive of his movements, and his family had discovered apparent conversation between Sharif and others regarding illegal activities, and he was experiencing personal struggles," said Sgt. Paul Parizek with the Des Moines Police Department. Police also say that Sharif was "hiding and staying with unknown friends at unknown locations." While some leads in the investigation indicated that he had been a victim of foul play, authorities ruled those leads to be false. "Detectives were able to obtain cell phone tower data which provided a very general look at Sharif's movement as he traveled east from Target. The last 'ping' from the phone was in the area of the Euclid Avenue bridge over the Des Moines River," Parizek said. On Jan. 30, detectives requested technology assistance from the Federal Bureau of Investigation. They also said they his father, who lives in Canada, hadn't heard from him since a week before Sharif disappeared."The Polk County Medical Examiner determined that Sharif had no traumatic injury to his body that would indicate an assault or other deliberate harm had come to Sharif prior to his death. His clothing, weather/water damage excluded, showed no signs of a struggle with another person," Parizek said. Authorities found Sharif's phone on him and it was given to the FBI for examination. The examination was completed on July 23. The FBI found that Sharif had been traveling at the speed of a vehicle for about 12 minutes after leaving Target and authorities were able to find video of Sharif getting on a DART east on Douglas Avenue. When he boarded the bus, Sharif didn't interact with anyone during the time on the bus according to the video. Police said there is no video of him exiting the bus. According to phone records, he traveled eastbound on Douglas Avenue before going south on MLK Jr. Parkway. At approximately 5:33 p.m. he was at a bus stop on 33000 block of MLK Jr. Parkway. The bus then goes south, but Sharif was northbound. The police said he moved eastbound on Euclid Avenue from MLK Jr. Parkway at 5:36 p.m. He used multiple apps on his phone during that walk and it included a FaceTime and a call to family. After learning about the phone call, police confirmed with a family member but they could not recall the context of that call. Police said at 5:43 p.m. Sharif was on the Euclid Avenue bridge over the Des Moines River where he took a photo of the river below him. One minute later he opened his Instagram account where he began to upload the photo. Authorities said, " also at 5:44 p.m. the phone stops providing data." They conclude that Sharif, "Jumped from the bridge committing suicide, or accidentally fell from the bridge. There is no evidence of any criminal act."