Jeremy Renner has often been in the news of late due to his hobby of flipping houses.

But new details regarding the alleged ways he used to flip out on his ex-wife were made public on Monday morning...

... and they offer a very frightening look at the actor's life and his failed marriage to Sonni Pacheco.

According to legal documents filed by Sonni, as part of her custody battle with Renner over six-year old daughter Ava, Pacheco cites a disturbing incident from just this past November.

She says that the veteran actor was at a club at the time, totally high on coke and drunk on alcohol, when he starting talking about murdering Sonni, telling someone he "could not deal with her anymore, and he just wanted her gone."

Pacheco also points to a separate incident in which Renner stuck a gun in his mouth... threatened to kill Sonni... and then fired a bullet into the ceiling, all while Ava was asleep in her bedroom.

It's unclear exactly when this alleged incident took place.

Wait, however, there's more to be extemely concerned over.

Pacheco claims that The Avengers star has a history of substance abuse, verbal and emotional abuse.

In these legal papers, Sonni says Jeremy repeatedly has been under the influence when spending time with Ava -- and that he once left cocaine on a bathroom counter, making it easily reachable by the toddler.

In one instance, Sonni alleges that a nanny overheard Renner state he was going to Sonni's home to kill her and then kill himself, because "it was better that Ava had no parents than to have [Sonni] as a mother."

Seriously scary stuff.

Renner and Pacheco got married 2014... and Pacheco filed for divorce later that year, citing “irreconcilable differences” as the basis for the break-up.

Pacheco has filed a request for sole legal and physical custody of Ava with the Superior Court of California, County of Los Angeles.

She is also asking for monitored visitation when Renner is with their daughter.

A court hearing has been scheduled for November 7, with the exes having been ordered to attend child custody mediation in the meantime.

In response to this horrific allegations, an attorney for Renner has released the following  statement:

“The well-being of his daughter Ava has always been and continues to be the primary focus for Jeremy.

"This is a matter for the court to decide. It’s important to note the dramatizations made in Sonni’s declaration are a one-sided account made with a specific goal in mind.”

We'll update this story with more news as it breaks.