(Des Moines, IA) -- Police are sharing the names of three teens killed in a crash south of downtown Des Moines. Police say 18-year-old Jamarion Jackson died when the car he and three others were in slammed into a tree. Eric Vortes, Jr. and James ‘JT’ Taylor III, both 15, died later at the hospital. Another 18-year-old remains in critical condition. Police say on Wednesday, an officer spotted the teens in a car that had been reported stolen. The driver sped away, and a few blocks later hit a curb, went airborne and struck a tree. All four teens were ejected.