Francis Pelosi, 56, of Boston, was arrested around 7 p.m. yesterday after he locked himself in an emergency-department men's room at Massachusetts General Hospital, the Suffolk County District Attorney's office reports.

While arguing with hospital staff and police trying to get him out, Pelosi allegedly threatened to kill the Chelsea police chief, the DA's office says, adding a former Chelsea chief now works in security for the hospital.

The following is a statement by Suffolk County District Attorney Dan Conley on preliminary findings into the death of Jay Carciero, 37, of Reading, at 50 Staniford St. on Oct. 27:

Boston Police report a psychiatric patient was fatally shot by an off-duty security guard after he attacked a doctor with a knife this afternoon in a Mass. General building on Staniford Street.

Police say the security guard, who does not work for Mass. General, shot Jay Carciero, 37, of Reading, "multiple times" after he had stabbed the doctor repeatedly. Both victims were taken to the nearby emergency room; he was pronounced dead, the doctor, identified by the Herald as Astrid Desrosiers, is in stable condition.

Channel 5 posts photos from the attack scene at 50 Staniford St., where Mass. General leases office space.

Police Commissioner Ed Davis talks about the violence.

This is the second knife attack in a Boston hospital in two days. On Sunday, somebody was stabbed in the neck in the Boston Medical Center emergency room. And it's the second attack of any kind at MGH - on Thursday, a man allegedly tried to rape a woman in a hospital restroom.

David Flavell, charged with attacking and attempting to rape a woman in a Mass. General restroom on Thursday was ordered sent to a secure unit at Bridgewater State Hospital for observation for 20 days to determine whether he's competent for trial, the Suffolk County District Attorney's office reports. He's next scheduled to appear in Boston Municipal Court on Nov. 16 for a status hearing.

Boston Police report David Flavell, 40, was arrested after allegedly attacking a woman in a hospital restroom. According to police:

Preliminary investigation, at this time, indicates that the victim was assaulted by the suspect but that no sexual assault occurred.

Flavell is scheduled for arraignment today in Boston Municipal Court on charges of assault with intent to rape and assault and battery by means of a dangerous weapon.

Flavell was convicted in 1998 of assault with intent to rape and in 2001 on two counts of open and gross lewdness and lascivious behavior, according to his record at the state Sexual Offender Registry, which lists him as a "a high risk to reoffend." In 2008, he was arrested on charges of assaulting a woman in a restroom at a Braintree bookstore. The Herald lists more charges against him.

His last listed address was 444 Harrison Ave. - the Pine Street Inn.

Mass. High Tech reports Jack W. Szostak won for his work in with telomerase and telomers, which help protect chromosomes.

Unfortunately, John Cass has had to take his son to the MGH emergency room twice. But he reports the facility no longer feels like something out of Dickens:

... Instead of Victorian brick, we visited a newly designed 21st century facility, where triage happened within minutes at an individual nursing station, then registration with a clerk, before waiting in the children's waiting room for half an hour. The whole experience took 2-3 hours, and though could not be contrasted with our earlier visit which really was life threatening, was a whole lot better because of the new facilities and to me better organization. ...

The Institute for Health Policy at The Massachusetts General Hospital is interested in how people are getting information about swine flu - and how you're dealing with the news. Take a ten-minute survey.

State probe launched.

Bay Windows has the scoop and talks to one of the 40 or 50 patients whose records were lost on the Red Line.