Sands went missing on Jan. 13 while hiking on California's Mount Baldy.
Hamzah Alsaudi, a San Francisco State University political science major, disappeared while swimming with his wrestling teammates.
The "Room With A View" actor and another hiker, Bob Gregory, are both missing as dangerous winter weather conditions hit the San Gabriel Mountains.
The Massachusetts man, now charged with his wife Ana's murder, made dozens of searches related to how to dismember and handle a body, prosecutors said.
Family members last saw Lesley Lemoine of South Carolina in March.
“At this time the family would love prayers and privacy. Thank you all!!!," the rapper's cousin wrote on Instagram.
"Wherever you are send us some signal. No matter what we will come get you son," said Lary Moses London, the rapper's father, in a statement.
Ken DeLand's parents said the 22-year-old called home on Friday, nearly three weeks after they last heard from him in France where he was taking classes.
Ken DeLand Jr., 22, was studying at Grenoble Alpes University. His parents say they last heard from him on Nov. 27.
Michael Ramirez returned home earlier this year after hiding out at the home of Holga Castillo Olivares, police said.