DENVER — The family of the youngest Interstate 70 crash victim, 24-year-old Miguel Angel Lamas Arellano, said they're still grappling with everything that happened.

Elena Arellano had no idea her son, Miguel Angel Lamas Arellano, was among the four who died during the fiery crash that occurred last Thursday and injured 10 others.

RELATED: 4 victims killed in fiery crash on I-70 identified

RELATED: 'If the last thing you hear is, 'I love you,' that’s pretty good:' Wife remembers victim of I-70 crash

Uriel Lamas confirmed it was him when he saw his brother's charred car with buckets of paint.

Family members described Miguel Angel Lamas Arellano as a very happy person with good intentions.

Rogel Lazaro Aguilera-Mederos, 23, was driving his semi-truck down from the mountains on I-70 when he struck the back of stopped traffic near 6th Avenue, according to police. 

Aguilera-Mederos has been arrested on suspicion of four counts of vehicular homicide and two counts of vehicular assault but has not yet been formally charged.

RELATED: Texas truck driver faces 4 counts of vehicular homicide after fiery I-70 crash

RELATED: Trucking company connected to I-70 crash has history of safety issues involving brakes

RELATED: Driver accused of causing fiery I-70 crash sends family and friends a message from jail

Crying, Miguel Angel Lamas Arellano's mom said in Spanish that she tries to think positively, but right now she just can't. It's been very difficult for her as a mother to forgive because nothing will bring her son back, she said.

Friends on social media describe Miguel Angel Lamas Arellano as one of the most humble men you'd meet.

His funeral services are scheduled for Friday. 

In all, 28 cars were involved in the accident. Aguilera-Mederos has his next court hearing Friday, May 4.

SUGGESTED VIDEOS | Full coverage of I-70 crash