HOUSTON – A family is demanding justice as well as answers after 18-year-old Alvaro Herrera was stabbed in the back and shot twice by a League City police officer in January.

The family of Herrera has filed a federal lawsuit demanding the officer involved be held accountable for what they say was excessive force.

READ: Teen killed in officer-involved shooting after attempted carjacking in League City

Police said they responded to a carjacking at a CVS in the 1200 block of League City Parkway. Officials said the suspect was armed with a pipe and on the run, and a detailed description was given to authorities.

Herrera, who was a high school student, was in the area where the officer was looking for the carjacking suspect. Officials said the investigation led police to a nearby neighborhood.

The officer came across Herrera and shortly after that Herrera was shot and killed. Police said the officer tried to detain Herrera, but Herrera attacked and tried to disarm the officer, and that's when he was fatally shot.

"The officer was looking for a suspect, but he was 7/10 of a mile from the area, but he came across Herrera, who was a high school student," attorney Randall Kallinen said. "No one identifies Alvaro as the suspect, but somehow the officer shoots him twice and stabs him in the back with a knife."

In June, the League City officer in question was cleared by a grand jury. KPRC 2 has reached out to League City Police Department for a comment, but we have yet to hear back from them.