Taking to Instagram on Wednesday, 34-year-old Allison posted a picture of herself and Stephen, who rose to fame on the Ellen Show, as she opened up about her grief.
"My ONE and ONLY Oh how my heart aches. We miss you so much," Allison wrote.
Her husband's dear friend Ellen DeGeneres shared her sympathies and commented: " There is so much love coming to you. I hope you can feel it."
Dancing with the Stars' Derek Hough added: "We love you Ally. We all have you," while his sister Julianne Hough wrote: "Wrapping you and your family in so much love."
Allison ran into an LAPD station last Tuesday after she was left deeply concerned he had left home without his car, which was unlike him, a law enforcement source told TMZ.
A short time later, it has been reported that the police received a call for a shooting at an LA hotel, where Stephen was found dead.
He was 40 years old.
Allison last used her Instagram account on December 12, just two days before Stephen's death.
The performer shared a sweet video of herself dancing with Stephen in front of their Christmas tree, with presents placed carefully in the background.
"HOLIDAY SUNDAY FUNDAY DANCE!!! With my lover," Alison wrote.
Stephen's mum Connie Boss Alexander has also shared an emotional tribute to her son as she thanked family and friends for their support.
"Family and friends, thank you for all the love, prayers and encouragement. Please know I see all the messages, texts, posts and the phone calls.
"I can't use words right now. Please know I will reach out when I can. Please continue to keep us in prayer," she wrote on Instagram.
Paying tribute to her son, Connie added: "Stephen Laurel, your mother loves you to eternity and beyond."
Back in September, she wished her son a happy 40th birthday.
"I thank God for the gift of you and for the #40 years He has covered, protected and blessed you through! To all the tomorrows and the next 40...Let's Go," she wrote alongside a series of pictures.
Connie added: "#SOMUCHMORETOCOME."
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