When he disappeared on April 7 it was out of character for the 19-year-old, who would rarely head off the beaten track without telling someone where he was going or if he was okay.

While Mr Graham loved the great outdoors - he was a prolific four-wheel-drive enthusiast, camper, fisherman and motorbike-rider - this was different.

"We all knew something was severely wrong, but we never gave up hope," Mrs Taylor said.

"I hoped that he was okay, that he was just taking time out from the world, but as time went by, deep down, I knew."

A search operation was launched but was called off when his body was found in Mount Canobolas State Forest two days later.

Now, almost a month after Mr Graham took his own life, his family have pleaded with anyone battling mental health demons to reach out for help.

"Just know that, even when you are at your lowest, you have people in this world that love you, that care for you and couldn't imagine life without you," his cousin said, urging anyone in a similar position to "please talk to someone".

"Please let someone in, whether it is a family member, a nurse, a doctor or a complete stranger," she said.

"Keeping these feelings bottled in is the worse thing you can do."

She said people shouldn't think twice to ask how someone is if they're acting differently, "to let them know you care and to be there for them".

"Depression isn't a choice, it's an illness," Mrs Taylor said.

"Like any other illness, you need help to get better. If someone reaches out to you, please, please be there for them. It might just save their life."

Mr Graham's life was remembered at his funeral this week, and Mrs Taylor said she would never forget her little cousin.

"Lewie was a very relaxed, down-to-earth and loving person. Anyone that knew Lewie well, knew ... he was a hard worker, loved his family and friends, but above all, he really was a top bloke."

VIDEO: Lewis Graham's friends set off on their drive to Mount Panorama the weekend after his death ...

"He had an infectious grin and laugh. Somehow things were funnier when he laughed."

Mrs Taylor said it was impossible to pick a favourite memory of him, but teaching him to ride a motorbike for the first time was one she'll "cherish forever".

"He picked it up quickly, maybe a little too quick as he was then speeding around the paddocks and giving me a heart attack," she said, also adding he loved playing guitar.

He composed his own music and taught others to play, also lining up in several bands after learning to play in grade four.

In the weeks since Lewis was found, his friends, family and the community, have rallied around each other to support those facing mental health battles of their own.

His friends organised a drive to Mount Panorama in Bathurst to remember their friend, while nearly 100 people donated $5800 towards his family, well in excess of the $1000 goal, a large portion of which will be passed on to a mental health charity.

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