Gregory Paul Ulrich, 67, is alleged to have suffered from an addiction to opioids
Ulrich was charged last week with second-degree murder, four counts of attempted murder, setting off explosives and carrying a pistol without a permit
Ulrich allegedly shot five people including one victim six times and detonated three homemade bombs at the Allina Health Clinic in Buffalo a week last Tuesday
Ulrich also left a rambling message on his cell phone recorded shortly before the attack where he spoke about his injuries and his intentions toward the clinic
Authorities found a plastic bag containing six oxycodone pills when they searched Ulrich a hotel room - he is said to have taken 30 at a time
REVEALED: Suspect, 67, who shot five at Minnesota health center had back surgery at the clinic several years ago and was given opioids
Gregory Paul Ulrich, 67, from Buffalo, was arrested and is currently being held in the Wright County Jail
Ulrich allegedly entered the Allina Health Clinic on Crossroads Campus Drive in Wright County late Tuesday morning and opened fire
At least five people were wounded and one died
The conditions of the four other victims is still not known and authorities have not confirmed if they are staff or patients
Brother Richard Ulrich said Gregory had been prescribed opioids after a back surgery and had become dependent on them
Wack job Minnesota gunman, 67, who killed a nurse and wounded four others at health center had threatened mass shooting there TWO YEARS ago - forcing doctor to get restraining order after stopping his opioid prescription
Gregory Paul Ulrich, from Buffalo, had a vendetta against the Allina Health Clinic on Crossroads Campus Drive in Wright County, Buffalo, and its staff
His vendetta is said to have stemmed from doctors refusal to give him opioids for a back injury
Ulrich vowed to do something big and sensational so that it makes an impact
He made threats against four Allina clinics, including threats of a mass shooting, according to a police report