Ramadan Abdi Shiekh Osman, 16, will be tried as an adult for the Sept. 22 shooting and death of Ahmednur Ali , according to charges made public Monday. According to a juvenile court petition, Osman allegedly had an argument with Ali several hours before the shooting. Witnesses said they saw him and several other young men arguing with Ali outside the Brian Coyle Community Center. At 5:10 p.m. that night, witnesses, whose names are being kept anonymous for fear of retaliation, said they saw Osman hit Ali in the head with a gun and then shoot him once in the head, according to the petition. Police arrested Osman on Sept. 26 and charged him with second-degree murder. Trespasser comes back to assault hospital worker Last week it was terroristic threats, this week itâÄôs trespassing and assault. On Sept 27, Christopher Sparks , 30, was arrested when he threatened the life of a University Medical Center, Fairview worker, according to a past police report. Sparks returned to the hospital Sunday morning, even though he has a trespassing warrant restricting him from all East Bank buildings, according to the police report. According to the report, Sparks hurt his face when police wrestled him to the ground, handcuffed him and removed him from the hospital at about 1 a.m. Police gave him a trespassing citation. At about 5 a.m., he came back looking for treatment, University police Deputy Chief Chuck Miner said . According to the police report, when Sparks came back to the emergency room, he started a fight with hospital security. Sparks pushed the security guard, who detained him until police arrived. This time, instead of releasing Sparks with a citation, police arrested him and charged him with fifth-degree assault. Mounted police arrest cyclist in Dinkytown Officers riding horses chased down a bicyclist for pedaling through a red light. According to the police report: At about 5 p.m., two mounted University police officers crossing at the intersection of 15th and University avenues southeast had to move around Gilbert Williams , 23, who was blocking the crosswalk. It appeared that Gilbert was going to ride through the red light and head into Dinktytown, so Officer Marianne Scheel warned him that he couldnâÄôt go. He went, and the officers pursued. Williams pedaled northbound on 15th Avenue and ran another red light, turning onto Fourth Street. Scheel and her partner, Officer Jessica Mendel , chased him, yelling for him to stop as he weaved in between cars stopped for a red light at the intersection of Fourth Street and 14th Avenue. As Williams attempted to make a left onto 14th, Mendel cut him off with her horse and caught him by the shirt. When police asked for his name, Williams identified himself as âÄúTerry WilliamsâÄù and said he had no middle name and no identification on him. But once the officers told him they would have to book him at Hennepin County Jail if they couldnâÄôt confirm his identity, Williams admitted that his name was actually Gilbert Terrence Williams , and the police released him with a false name misdemeanor, according to the report. Miner said this isnâÄôt the first time that one of the UniversityâÄôs four mounted patrol officers has arrested someone on a bicycle, but it is the first time a mounted officer chased a cyclist. âÄúIt just goes to show,âÄù he said, âÄúthat a bike canâÄôt outrun a horse.âÄù