“Dateline NBC” will premiere a program on Friday about the 2002 disappearance and murder of Laci Peterson and her unborn son, Conner, in Modesto.

In connection with promotional material for that episode, the Dateline NBC Facebook page has also posted short segments on the Tuolumne County disappearances of Troy Galloway, Darvis Lee Jr. and Willie Elgen.

“Laci’s loved ones know that, for many families in their position, the not knowing is the hardest part. Sharon [Rocha] and Laci’s friend Stacey Boyers want to honor Laci’s memory by shining a light on other cases — other families — from their area,” said a post to the Dateline NBC Facebook page.

In the short video clips, each a little over a minute long, family members share their respective memories of the missing people and the situations surrounding the disappearances.

Each of them conclude with an appeal to the public to share any information about the missing person with the Tuolumne County Investigations Unit.

Willie Elgen is identified in a video as last seen on a trip to Twain Harte around Dec. 29, 2010.

“I don’t want him forgotten,” Brandi Elgen, his sister-in-law ,said in the video. “I want him found.”

Elgen’s jacket and dog were found inside a Mount Provo cabin in December 2010, The Union Democrat reported.

Darvis Lee Jr. was last seen in the Columbia area on Oct. 19, 2010, according to the Dateline video.

Lee’s car was found in the area of Quail Mine Road three days after his disappearance. On Jan. 15, 2011, Lee’s jawbone, which was confirmed by dental records, was found by his mother and father near Five Mile Creek.

His father, Darvis Lee Sr., said through tears in the video, “I carried his jawbone out of that canyon in my hand, and I can tell you it will break your heart knowing that that's part of you, you know, that it's my son.”

Troy Galloway was last seen on Jan. 13, 2016, leaving his home in Sonora, his video said.

Galloway, who served in the Marine Corps, the video said, suffered from PTSD and depression.

“I just want to find him, I want to talk with him, I want to hug him,” said Nancy Galloway, Troy’s mother, in the video.