The Donnager marine lieutenant who dies after getting Holden's crew aboard the Tachi and making their escape possible.
Lieutenant Kelly leads the civilians through the Donnager's boarding action and is caught by the hangar blast that kills or scatters his marines. His powered armor is crushed along the left side and leaks both hydraulic fluid and blood, but he continues moving toward the ready standby bomber. He gives Alex Kamal the access card, identifies the ship as the Tachi, and orders the immediate launch that gets the four survivors out.
The damage to Kelly's body is worse than his armor conceals. High thrust after launch breaks the ribs on his left side and punctures his organs; Naomi Nagata finds him dead before the crew can help. Holden and Alex preserve his body in the Tachi's cargo bay and record the full military honors required for eventual return to Mars. His final service is the conscious choice to spend his life getting strangers off a doomed flagship.
Kelly is an adult Martian marine officer in heavy vacuum-rated powered armor. His canonical look is his armed, composed professional bearing before the escape injuries that kill him.
Kelly is the marine officer whose evacuation order and final endurance save the last four Canterbury survivors.