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

— -- 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.

"The protest was to show UC students' concerns about the lack of transparency and accountability especially with the delayed timing of the evidence being released," Shelton said. "It was heartbreaking. Yesterday, [Dubose's] 9-year-old son was filled with poignant questions such as, 'How this happen?' 'Can we see the video?' 'Why can’t we see the video?' They're delaying this child's closure."

The University of Cincinnati Police Department did not immediately respond to ABC News' requests for additional information.

Shelton added that the protest was one of many the group organized in the past eight months in solidarity with the national #BlackLivesMatter movement that protests what it believes is structural racism in police departments across the country that lead to the unfair treatment and deaths of black suspects.

"We've had enough of these events, the loss of black lives unnecessarily," Shelton said. "We want to see change. These similar events have happened in the past, and there's no question that there is a systemic bias against people of darker skin tones."

Cincinnati Police Lt. Colonel James Whalen, who is leading the investigation, released few other details on the shooting. He said Dubose did not have a weapon in the car. When asked what the threat was to the officer, Whalen said, "We haven't had a chance to talk to the officer yet to find that out."

Evidence from the investigation has been presented to Hamilton County Prosecutor Joseph Deters, who will review the case to determine if any criminal charges are warranted.

A spokeswoman for the Cincinnati Police Department told ABC News the department could not comment further on the case because it is still under investigation by the Hamilton County Prosecutor's Office, which is "rapidly investigating" the incident. He expects that their assessment will be "complete before the end of next week."

Cincinnati Mayor John Cranley told ABC News his "condolences go to the Dubose family for this tragic loss of life" and that he had "great confidence" in the Cincinnati Police Department's investigation and that he trusts the prosecutor, Joseph Deters, "will do what is right."

The other co-founder of UC Students Against Injustice, Toby Akomolede, added that the atmosphere of the "peaceful protest" on Tuesday was one of communication with the intention of understanding what happened.

"We talked with the university's police chief, and he tried our best to answer our questions, but he couldn't reveal too much," Akomolede told ABC News, adding that they also initiated a conversation between the chief and Dubose's family.

But Dubose's stepdaughter, Nakiima Reid, told WCPO she didn't leave with the answers she wanted.

"After speaking to the police chief, I think that we have a better understanding of the investigative process," she said. "It doesn't mean we like it, but we understand. There's a lot more questions we have, mostly pertaining to the case, like what [caused] for the gun to be withdrawn? Was there an eminent threat?"