An 18-year-old Washington state man who led police on a high-speed chase across three counties in the Twin Cities crashed his vehicle and then charged at officers with a knife, state investigators said Friday.

The state Bureau of Criminal Apprehension said Friday that officers killed Johnathon Dean Mar, 18, of Kennewick, Wash., after his sport-utility vehicle crashed on Interstate 694 and he ignored repeated requests to put down a knife. Mar had led police on the 18-mile chase, reaching speeds of up to 115 miles per hour from Maple Grove to Shoreview after police say he fatally shot Matthew Paul Maffei, 23, in the head at a rest stop off I-94 in Maple Grove.

The police chase ended at 1 a.m. Wednesday with Mar’s SUV crashing in Shoreview. The BCA said Friday that he then emerged from the vehicle with a knife and began repeatedly stabbing himself. Mar ignored repeated commands to stop and get on the ground, the BCA said, and then charged at officers with the knife. Mar was shot multiple times and died at the scene.

The BCA identified the two officers Friday as Hennepin County Sheriff’s deputy Matthew Hagen, a 15-year officer, and Brooklyn Center Police officer Alan Salvosa, a four-year veteran of the department. Both are on a standard administrative leave.

On Thursday, the Hennepin County medical examiner identified Maffei, listing his address as unknown, but records show he has lived in both Ephrata and Kennewick, Wash. Why the two men were in Minnesota and what led to the shooting before the police pursuit remains unclear.

The BCA is still investigating the officer-involved shooting, and Maple Grove police are investigating the rest-stop homicide. When the BCA’s investigation is done, the officer-involved shooting case will be sent to the Ramsey County attorney’s office for review.

So far this year, there have been 18 officer-involved shootings in Minnesota that have been reported to the BCA, including a high-speed police chase on Hwy. 212 during the morning rush hour Feb. 7 that ended in the fatal shooting of a couple who also had a knife. In 2013, 22 officer-involved shootings resulted in eight deaths in Minnesota and in 2012, 27 officer-involved shootings statewide left eight dead.