Knox dentist recalls work with *selfless* in Yemen Two of his ex-colleagues were shot dead at hospital By RACHEL KOVAC, kovacr@knews.com January 1, 2003 Dr. Mac Prevost was sitting at home Monday when his father called to tell him two of his former colleagues had been killed in Jibla, Yemen. From 1982 to 1983, Prevost worked at the Jibil Baptist Hospital with Dr. Martha C. Myers and William E. Koehn, the hospital director. Myers, Koehn and Kathleen Gariety were shot Monday morning at the hospital by a Yemeni man identified as Abed Abdul Razak Kamel. "When I found out, I...