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In 2366, he developed a Krieger wave converter in his orbiting research station above Tanuga IV. The research was supported by the Federation and Commander William T. Riker visited him to check on his progress. Apgar concealed the discovery from Riker because he decided to sell the Krieger wave converter as a weapon. Apgar's attitude plus his request for extra material so he could complete the weapon caused Riker to become suspicious of Apgar's intentions. Fearing he might be exposed, Apgar decided to kill Riker. As Riker was transporting back aboard the USS Enterprise-D, Apgar fired a Krieger wave at him, but the beam was reflected back into the station's main reactor by the transporter beam surrounding Riker and Apgar was killed when the station exploded. (TNG: "A Matter of Perspective")