Why did Bruce Hyde leave Star Trek?

Kevin Riley in the original Star Trek series, having appeared in two episodes, The Naked Time and The Conscience of the King. Hyde was diagnosed with throat cancer in 2010 and successfully fought it off in 2011. However, it recurred in January 2015 and he died on October 13, 2015.

Who played Kevin O’Reilly on Star Trek?

Bruce Hyde Bruce Hyde, who played Lt. Kevin Riley on the original Star Trek series, has died. Hyde had suffered from throat cancer and died October 13 in hospice near St.