Sandy, I would first have your friend check the verbiage in the Lease both Residents signed for some direction. A lot of times, there is language that states one can be evicted for criminal activity but that is certainly vague language and depending on the Judge it might not stand up under that Judge's scrutiny if you try to evict just on an accusation.
Second, the Manager must now get a copy of the No Contact Order. Third, the Manager must meet/discuss the issue with the Accused Resident. It is entirely possible this Resident experienced a beginning mental health episode, early stages of dimentia, or an alcoholic episode, or a TIA (mini stroke), which could be a one-time only thing or the beginning of a nightmare. The Manager might contact the local police department and ask the Officer about the nature of the case, too, to get the actual facts and the Police Report.
I understand the feeling of issuing an immediate eviction notice, but that really depends on the Lease provisions and state, local, federal laws. If it turns out the lease allows action for this offense, then the Manager should do this and should not delay it. This can cost those three Owners some big money should they allow this person to stay if he reoffends in the meantime.
I have had to deal with this onsite in differing degrees of offense. It isn't fun, but the rights of all residents should, one would think, outweigh the rights of a single individual when it comes to exposing himself to others. Since it appears it happened right there on the property in a common area hallway, it is our duty to protect the neighbors as best we can in every way possible.
I know I had a young lady (and I use the term loosely) who had a boyfriend who was a convicted sexual deviant. She did not seem to understand why, when I found this out from a neighbor, that I forbid him from being on the property (and she had a baby daughter.) He was accused and convicted of sexual contact with a twelve-year old. I can't say who (wink, wink) posted the photo of the guy, or who sent this info to the elementary school across the street, but I can tell you I trespassed him off the property. When I SAW him there a couple of days later, I called the police. It was not the usual officers I worked with who responded to the call. It was very clear, the Officer did not take my complaint seriously. So, after he left my office to go to the unit, I grabbed the unit keys and followed. The guy would not answer the door. (The resident was not home at the time. She was at work.) The cops were going to leave, so I beat down the door and told the guy to open the door. He reluctantly did and I told him to step out of the apartment. He was there to "babysit" the resident's daughter. Oh, hell no. I MADE the police arrest him and remove him from the premises and I called the mother and told her she had five minutes to get to the property or I was calling CPS to remove the baby. She arrived on site, saw her boyfriend in the back of the police car and insisted she had no knowledge of the boyfriend being a sexual predator. Finally, after I point blank told her she needed to face the truth, she said, "Oh, that girl let him have sex with her. Y'all just don't know what it was like. She came on to him!" Yeah. Right. I gave her her Notice that evening and she left voluntarily although she threatened all kinds of legal action against me and threatened me physically.
Sandy, your friend has to take this situation seriously and insist that her property's Owners take it seriously, too. Better to be cautious and approach the situation as to the lease language first, but the Owners need to follow through with action. I do feel it is within the property's best interest to insist that, due to the nature of the charges, this gentleman at least make other living arrangements until the charges are sustained or dropped (especially if there is no specific language in the lease regarding criminal activity.) If the guy has a contact info release form, I would call his family and let them know what is going on as well, so that he could stay with them. The Complaining Resident would then feel safer. They deserve that. Of course, you and I both know the entire community by now knows all about what happened and that will always negatively impact the Owner, Manager and community.