Nickayla Rivera asked fans to "show compassion" after a report that she is living with her late sister's ex-husband and their son.
"My shmaya, I’ll love you for eternity & miss you every second of my life," model Nickayla Rivera wrote in her first post since her sister's death.
"This is so unfair … there’s not enough words to express the hole left in everyone’s hearts,” he wrote.
"To see her sitting with her baby really just gets me," the Broadway actor and singer said in an emotional tribute to her former co-star.
The 33-year-old actor's body was found Monday after she went missing during an outing on Lake Piru in California with her 4-year-old son last week.
The 33-year-old actor had been reported missing while boating with her son last week and search efforts began shortly thereafter.
Morris contacted authorities to ask if she can "help in any way" as they continue to look for Rivera.
The 33-year-old went missing on Wednesday after renting a boat in California.
Authorities said the search for the actor will resume at first light Thursday morning.
The actor and singer acknowledged she'd "acted in ways that hurt other people" after Samantha Marie Ware accused her of making the show "a living hell."