Although Kim and Monty were divorced, they still maintained a "very special relationship," a source tells E! News. "Rarely can exes be friends but they truly adored each other and were the best of friends."
Their close relationship has made it hard for Kim and her family to try and move on. The insider tells us that Kim is having an "incredibly tough time" coping with Monty's death, so she called in some emotional support. "[Monty's other ex-wife] Terri Lynn Doss is staying with her at her house in L.A. to lean on each other for emotional comfort," the insider explains. "Kim's daughter Brooke is completely devastated by the loss as well, as she was very close with her father."
Even though Monty was diagnosed with lung cancer two years ago, a fact that was "very tough on the family," his rapid decline in health happened out of nowhere, which has left Kim and her family even more shocked. "It spread to his brain and although he has been in the hospital for quite some time, his death was very sudden," the source adds. In fact, his turn happened all in one day.
According to our insider, Kim had been visiting Monty every day when he went into a coma one morning, which prompted Kim and Terri Lynn to call everyone into the hospital. When everyone arrived Monty briefly opened his eyes and "looked at everyone around the room," but then he took his last breath and died in front of his family.
"That was extremely traumatizing for Kim and her daughter," the source adds.
Fortunately, the family has been sticking together to help each other get through this sad time. "Her sister Kyle [Richards] and Terri Lynn have been by her side, grieving together," our source explains.
Both Kim and Kyle attended the memorial together.
Kim broke her silence following Monty's death with a touching Instagram post. "Yesterday I said goodbye to the best friend I've ever had in my life…Monty was an amazing person with an amazing soul," she wrote.
"We shared over 30 years of love & happiness and brought a beautiful daughter into the world. I am so grateful for all that we shared. I know we will be together again one day. I love you Monty."