He says he and the actress' mother Sharon "both sobbed and sobbed. I haven't gotten out of bed yet. I pulled the report away from Sharon because I thought I was going to have to sedate her."
Despite the anguish, he tells Us he found "solace" in the report because it reaffirmed what he had been insisting all along – that his wife never abused illegal drugs. (The report stated that she had "elevated levels" of Vicodin and drugs from over-the-counter cold medicine in her system.)
"She never did anything that she was accused of!" he tells Us. "We never hid anything. And that's been the case with everything in our marriage. Maybe with her death, people will start to realize – yes, we had a lot of prescriptions around, but if you look at some of them, they date from 2001!"
As for doctor's reports that Murphy's death could have been prevented, Monjack tells Us, "Any death could be prevented. It's a tragedy."
Monjack says he had no idea that his wife was suffering from pneumonia which, exacerbated by multiple drug intoxication, caused her to die Dec. 20 at age 32.
"Like all deaths, I go over and over and over it," he says. "She was dead within two hours of waking up, saying 'My chest is tight. I can't take a breath!' But that was part of her normal menstrual cycle. It was the perfect storm."
He tells Us he wishes people would leave him alone and "stop coming out with these ridiculous stories" about their marriage.
"Our marriage was dogged by these ridiculous rumors. Brittany's life was dogged by ridiculous rumors, and the truth always wins out," Monjack tells Us. "I hope people have the sense to really understand that everything was beautiful and wonderful in our relationship and so pure."
Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!