The nurse said she heard two shots.
"Pam will be missed, but we know she is with her Lord and Savior", the town said.
The hospital had resumed normal operations as of Tuesday evening.
There is an active shooter investigation at the Dartmouth-Hitchcock Medical Center in Lebanon, New Hampshire. However, no confirmation has been received regarding shots being fired. Ferriere was being treated for an aneurysm. She was to be discharged Friday. Deputy Medical Examiner Jennie Duval ruled the death a homicide.
No motive was given, with Robert Ferriere saying Wednesday, "I'm not a mind reader". The Valley News had also previously reported this development.
The New Hampshire Attorney General's office is now investigating.
Anyone with information on Frink's whereabouts before the shooting is asked to contact the New Hampshire Major Crimes Unit at 603-223-8568.
Neighbors in Rhode Island said that he mostly kept to himself, though had experienced tragedy four years ago.
Travis Frink, 48, of Warwick, Rhode Island, is charged with first-degree murder.
Denver police responded to a report of an active shooter at Rose Medical Center in Denver on September 16, 2016. He said he and his wife married 20 years ago.
Police went room to room searching for the suspect.
This item has been corrected to show man's surname is Frink, not Frank. His LinkedIn page includes a long list of experience in computer systems administration and technical support jobs in Rhode Island, Connecticut, New York and MA.
Frink's lawyer didn't immediately return a voicemail message left Wednesday by The Associated Press.
It's still not clear if a shooting happened Tuesday at Dartmouth-Hitchcock Medical Center in Lebanon.
"You became very creative over the hours...one team set up a MASH unit in the parking lot and saw over 40 patients, removed stitches, changed dressings and scheduled those patients to return later this week for follow-up", she wrote.
An email from the hospital sent earlier Tuesday afternoon said the Dartmouth-Hitchcock campus is on lockdown, a shelter in place order is in effect, and Hanover and Lebanon police are on the scene.