University of Cincinnati Cop's Fatal Shooting of Unarmed Man Samuel Dubose Under Investigation

Sam Dubose was shot in the head after pulled over for a missing license plate.

— -- Family and activists are demanding answers after an unarmed black man was shot in the head and killed by a University of Cincinnati officer near campus this past weekend.

Samuel Dubose was pulled over for a missing front license plate on his vehicle Sunday night by UC Police Officer Ray Tensing, according to department chief Jason Goodrich, who spoke at a news conference Monday, ABC News affiliate WCPO reported.

Dubose apparently refused to provide a driver's license, produced an open alcohol bottle and a struggle ensued, during which Tensing was knocked to the ground, Goodrich said.

Tensing, whose name was released by officials, then fired one shot into Dubose's head, killing him, according to Goodrich.

Tensing was treated at a hospital Sunday night for minor bruises on his legs, police said. He is on paid administrative leave, which is standard procedure. It was not clear whether Tensing, who is white, had legal representation.

Dubose's death comes amid recent national attention and protests against police killings, especially those involving white officers and African-Americans, including Michael Brown in Ferguson, Missouri, Eric Garner in New York City and Walter Scott in North Charleston, South Carolina.

A group of more than 50 students joined the UC Students Against Injustice along with some of Dubose's family, including his stepdaughter who is an alumna of the university, outside the university's Public Safety's Headquarters Tuesday afternoon, the group's co-founder, Alexander Shelton told ABC News.