LEWISVILLE — A Little Elm teen who stopped to help a motorist in a wrecked vehicle on Interstate 35E was killed early Sunday when another vehicle hit him, police said.

LEWISVILLE — A Little Elm teen who stopped to help a motorist in a wrecked vehicle on Interstate 35E was killed early Sunday when another vehicle hit him, police said.


The teen was identified as Louis Aleman-Mendoza, 18, who died Sunday morning shortly after arriving at Medical Center of Lewisville.


Two other people were injured in the four-vehicle accident, which was reported about 4:30 a.m. Sunday in the 2400 block of Interstate 35E.


Witnesses told police that at first a single vehicle had been involved in an accident on the highway. Two other drivers including Aleman-Mendoza stopped to help.


A fourth vehicle hit the stopped vehicles and Aleman-Mendoza.


A man who was injured in the first accident was taken to Plano Presbyterian Hospital, where his condition was unavailable.


The motorist who hit Aleman-Mendoza and the two vehicles was taken to Parkland Memorial Hospital in Dallas with unknown injuries, police said.


Initially, police said they believed alcohol may have been a contributing factor in both accidents, but Lt. Scott W. Haynes said that only one arrest was made Sunday.


Police arrested Tristan D. Harris, 35, of Lewisville, who is accused of intoxication assault with serious bodily injury. He was the driver involved in the initial, single-vehicle crash. A passenger in the vehicle he was driving was taken to the Plano hospital.


The driver who hit the teen was cooperating with police, Haynes said.


The highway was closed for several hours as authorities investigated. Haynes said the investigation continues.


Domingo Ramirez Jr., 817-390-7763


Twitter: @mingoramirezjr


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