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Out about it, we took the proper actions, person's no longer in contact with any patients whatsoever, and there's an investigation. that's what we knew. we did not know that there was a homicide that was connected with this activity way back when. >> reporter: there is a person of interest. a hospital spokesman tells fox news, quote: a allegations of potential misconduct do not involve any current v.a. medical center employees. the v.a.'s inspector general's office and federal law enforcement are investigating. the i.g. says at this time we cannot comment further on those activities. following...

But investigators say what someone did at a v.a. hospital in west virginia was murder. potentially as many as 11 patients. suspicion arose last year when authorities asked the daughter of 82-year-old army vet felix mcdermott if they could exhume his body. she agreed. someone had administered a shot of insulin to his abdomen. mcdermott did not have diabetes. it killed him. >> mr. mcdermott did suffer from dementia, and the ones that i've talked to or that i've seen, seems that's one of the common traits is that these people were defenseless. there's a complete system failure here that would all...