Taking to her website, Jill informed fans that Bobby Zarin, 71, ‘passed away peacefully’ yesterday.
"With the heaviest of hearts, we are devastated to share the news that our beloved Bobby Zarin passed away peacefully today surrounded by family after a courageous battle with cancer. There are no words to describe how heartbroken we are. Thank you, everyone for all your love, and support during this difficult time."
Bobby, a real estate developer, was diagnosed with thyroid cancer in 2009, before undergoing radioactive iodine treatment and having his thyroid removed.
In 2013, doctors discovered that the cancer had spread to his lungs. He underwent more treatment. In November 2016, Jill revealed Bobby had a cancerous brain tumor.
"It's been a difficult year since his brain tumor diagnosis but ironically that's not even the issue," Jill told E! News in July. "His papillary thyroid cancer has morphed into something called anaplastic thyroid cancer. It's very, very rare."
Last January, the couple celebrated their 16th wedding anniversary. “Happy 16th wedding Anniversary to the most wonderful husband, father and friend in the world. I love you with all my ❤❤❤ we will get thru this and be together forever,” Jill wrote in a social media post.