PHOENIX - The pedestrian struck and killed by a semi on Loop 101 Wednesday night died by suicide, the Arizona Department of Transportation says.
The 17-year-old -- DPS initially said he was 24 -- was taken to a hospital in critical condition by Phoenix fire officials. He later died.
Northbound lanes were closed from Interstate 10 to Indian School Road into the night.
Northbound on-ramps from McDowell and Thomas roads were also closed.