The man, 83-year-old Silvestre Orosco, is one of three ailing patients Fontana is accused of killing at Wilford Hall Medical Center in San Antonio last summer.
Orosco's daughter-in-law, Margarita, was among the last of 12 witnesses at Lackland Air Force Base for Fontana's Article 32 hearing.
The proceeding is similar to a civilian grand jury. An Air Force colonel who presided over the hearing will now recommend whether to send the case to court-martial.
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