The 72-year-old Catonsville resident currently serves as vice president of Patapsco Heritage Greenway, formerly called Friends of Patapsco Valley and Heritage Greenway.
Despite his condition, Valentine remains active in the community. He still attends meetings and makes phone calls from home, though he admits he'd rather be spending his time outside.
Since 1992, he has taken on a leading role with Patapsco Heritage Greenway, a nonprofit that works to preserve the undeveloped Patapsco Valley between Daniels and Elkridge.
"Kit Valentine is one of the most influential and active volunteers to help jump-start the Patapsco Heritage Greenway's stream watch program," said Betsy McMillion, director of restoration and education programs at Patapsco Heritage Greenway.
As former president of the organization, Valentine was instrumental in obtaining grant funding from Baltimore County for a part-time coordinator to run the stream watch program, McMillion said.
The program is composed of volunteers who monitor streams in the lower Patapsco River watershed area for pollution.
While he's been with the group, its volunteers have removed nearly 350 tons of trash and debris from the Patapsco Valley, Valentine said.
Valentine also serves as an honorary board member of Catonsville Rails to Trails, another local nonprofit that promotes a healthy lifestyle through hiking and biking along what were once the routes of railroads and streetcars in the Catonsville area.
"He's put his whole life into it. He's a real advocate for nature, trails and the environment," said Maureen Sweeney Smith, executive director of Rails to Trails.
Sweeney Smith said she was devastated to hear the news that Valentine was diagnosed with pancreatic cancer.
"I miss him so much when we have cleanup days," Sweeney Smith said.
Sweeney Smith said his upbeat personality and concern for the community make him a joy to be around.
As a member of both organizations, Valentine said his goal is to enhance the community for future generations.
"Kit has made a huge difference for southwest Baltimore County. He has been a tireless advocate for protecting and cleaning up the environment," said 1st District Councilman Tom Quirk, an advocate for increasing the use of bicycles and pedestrian-friendly paths.
A retired lieutenant colonel, Valentine spent 25 years in the Army, where he worked as an artilleryman and an environmental engineer. He served two tours in Vietnam during the war.
When he retired from the military, he began teaching ninth grade at St. Timothy's Church School on Ingleside Avenue.
He said his active role in the community stems from his involvement with the Eagle Scouts as a kid growing up in Catonsville.
It's a role that changed suddenly last fall when Valentine discovered he had pancreatic cancer after undergoing a hip replacement surgery. After the surgery in November, he thought everything would be "hunky dory."
Yet it turned out the pain he felt in his side was actually a tumor in his pancreas.
There are usually three options for treatment — surgery, radiation or chemotherapy.