The 21-year-old professional wrestler has been left devastated by his dad's shock passing, with the Beverly Hills 90210 star dying at the age of 52 after suffering a stroke last week.
Sharing a throwback photo of himself with his father, as well as a more recent snap of himself wrestling, Jack wrote: "He was a lot of things to a lot of people. To me, he was always Dad.
"He loved supported me in everything, and inspired me to be the best that I could possibly be.
"I've learned so much from you, and my heart is broken thinking about everything you won’t be here for.
"I'll miss you every day that I walk this earth.
"I'll do whatever I can to carry on your legacy and make you proud.
"I love you Dad."
The star was inundated with supportive messages from his followers, with one writing: "He's already proud of you Jack. He always will be."
Another added: "My heart breaks for you. Prayers to you and your family during this difficult time."
The post came just hours after it was revealed that Jack, who goes by the wrestler name Jungle Boy, will not be taking part in the Bar Wrestling show that he was scheduled to attend on March 13.
A tweet sent from the event's promo page said at the time: "Unfortunately Jungle Boy will no longer be wrestling at our March 13th show.
"Our thoughts and prayers are with him and his family at this time."
It was previously revealed that Luke's family had to make the "devastating" decision to take the Riverdale actor off life support after initially thinking that he would pull through following his stroke.
A source told US Weekly at the time: "Luke’s loved ones were hoping they’d pull him out of it after 48 hours or so but he never recovered."
Jack, as well as Luke's 18-year-old daughter, Sophie, and ex-wife, Rachel Sharp, were forced to make the decision, with the insider adding: "It was devastating."
Sophie had made a frantic journey back from South Africa to be by her father's side during his final moments.
Luke left his entire estate to Jack and Sophie, with the star drafting up a will after suffering a "cancer scare" in 2015.
Sophie previously said of her loss: "A lot has happened in this past week for me.
"Everything is happening so fast. I made it back from Malawi just in time to be here with my family, And in the past 24 hours I have received an overwhelming amount of love and support."
She continued: "I cannot individually respond to the hundreds of beautiful and heartfelt messages, but I see them, and appreciate you all for sending positivity to my family and I.
"I’m not really sure what to say or do in this situation, it’s something you aren’t ever given a lesson on how to handle, especially when it’s all happening in the public eye.
"So bear with me and know that I am grateful for all the love. Just, being grateful quietly."
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