Tanya Roberts' longtime partner is planning a celebration of her life, but before that, he plans to honor her in an L.A. location near and dear to her heart.
Lance O'Brien tells TMZ ... the late model and actress is going to be cremated, and he's going to spread her ashes in the hills behind their home in Laurel Canyon, where she used to hike regularly with her dogs.
Lance says Tanya would go on a 4-mile hike with her 2 beloved pooches 5 times a week, and he adds ... they're very much missing their mom.
Tanya's partner tells us it's been an incredibly difficult week, but he's trying to work out plans with her family and friends for a memorial service, or some other way to pay tribute to her.
We broke the story ... the actress best known for "That '70s Show" and "Charlie's Angels" died Monday night, potentially from a UTI that spread to her kidneys and liver.
News of her death was bizarrely announced prematurely a day earlier though, the result of what seemed to be a major miscommunication between Lance and Tanya's rep after Lance visited her at the hospital Sunday night.
Lance says the hospital staff told him it was just a reflex, and then her eyes closed and she was out. He left her room thinking she had died ... until the hospital called Monday morning to say she was still hanging on.