It was the kind of face-to-face encounter between witness and accused that is supposed to wait until court. It was not supposed to happen at the jail, and certainly not to Mayhew, who had been offered a spot in a witness protection program to remain shielded from the two murder suspects.
One of them — a nephew of Mayhew’s — leaned toward the glass and asked his uncle if he had “decided” what he would do. It was a clear reference, prosecutors allege in new court filings, to the testimony Mayhew could offer about the night in 2011 when he said he was called to a remote site and asked to help cover up the killing of two men.
In December 2012, weeks after the encounter in the jail and as the trial for his nephew neared, Mayhew, 25, was executed — ambushed and shot repeatedly in the face as he carried his 2-year-old son up a flight of stairs to his mother’s apartment.
Prosecutors have charged the nephew with murder in Mayhew’s death, alleging that he orchestrated a hit from behind bars.
But the case has also sparked administrative and criminal investigations that have revealed security flaws at the Prince George’s jail in Upper Marlboro, according to court records and several law enforcement officials with knowledge of the inquiries. They spoke on condition of anonymity because the case against Mayhew’s nephew has yet to go to trial, and investigative work into jail operations is ongoing, they said.
The security issues at the Prince George’s jail are coming to light after federal prosecutors alleged widespread collusion between guards and violent gang members at a state-run detention center in Baltimore.
In the Prince George’s jail, another of the busiest jails in Maryland, administrators have little information about inmates’ contact with the outside world. Unlike at most jails in the D.C. area, Prince George’s does not directly monitor or record visits with friends or family, and inmates routinely shield their calls from investigators monitoring recorded phone lines.
Yolanda Evans, a spokeswoman for the Prince George’s Corrections Department, said that jail officials have cooperated with police investigating Mayhew’s killing, but that she is unaware of any ongoing probe of jail operations.
Evans acknowledged that the episode in the visiting booth should not have happened, saying an internal investigation revealed that a corrections officer who had been on the job just two months mistakenly violated jail protocol. She declined to say whether the officer had been reprimanded, saying the issue was a personnel matter.
Before and after that encounter, however, there were other problems at the jail, court records and interviews indicate. Jail administrators for some time failed to separate Nicoh Mayhew’s nephew, Brian Mayhew, 21, from his co-defendant in the double slaying. As Brian Mayhew allegedly plotted his uncle’s killing, he was able to talk daily with Kenan Myers, 26, in a common area, according to two law enforcement sources with knowledge of the investigation.