There has been a renewed appeal for information from the family of Cian McLaughlin, the Irish man who disappeared in a US national park last June.
The 27-year-old Dubliner was last seen at Grand Teton park in Wyoming on Tuesday 8 June.
A climbing guide reported seeing a solo hiker, matching Mr McLaughlin's description, on the Garnet Canyon Trail. His car was later found parked near Lupine Meadows.
His family has issued a new poster, appealing for help in finding the "incredibly adored" young man.
The flyer, posted in locations near the park, states: "The weather is changing rapidly and we have a small window to bring home this incredibly adored young man.
"We desperately need your help to find him and get closure for his loved ones who have been frantically searching over four long months to locate Cian."
It details how Mr McLaughlin was wearing a red Apple Watch, white t-shirt, a pair of shorts (reportedly), wire rimmed sunglasses and a unique silver necklace on the day he went missing.
The family notes that Mr McLaughlin is "an incredibly friendly person, it is likely that he would stop and chat with people or say hello in passing. We believe that he was alone".
Photographer Sargent Schutt is among those who met Mr McLaughlin in early June in Grand Teton National Park and took several photographs of him, one of which is used in the new poster.
"We spent hours together talking about all manner of things, and my wife and I were both impressed with what a great spirit he was," he told RTÉ News.
"We looked forward to seeing him again, moreso than with most anyone I've known for such a short time.
"We and our other friends who knew him here have been deeply saddened by his disappearance, and hope for closure for all of his family and friends in this very unexpected situation."
Travel blogger Gabby Petito and hiker Robert Lowery were also reported missing from Grand Teton Park in recent months. Their bodies were later recovered by search teams.