Nels Anderson II, 22, a lifelong resident of Greenbelt and a 1977 graduate of Parkdale Senior High School in Riverdale, died April 20 in a climbing accident near Woodstock, New Brunswick, Canada.

A member of the Royal Canadian Mounted Police said that Mr. Anderson and four Canadian companions were on a camping and climbing expedition when Mr. Anderson fell over a cliff and into a waterfall.

One of his companions died attempting to reach him. A third perished while the remaining two members of the party were summoning help from authorities, the RCMP said.

The RCMP official said the investigation into the accidents were incomplete.

Mr. Anderson was civil engineering student at the University of New Brunswick. He had recently won the Allan K. Grimmer scholarship at the university, where his grandfather, Nels Anderson, is professor emeritus of sociology and his sister, Elizabeth MacLellan, teaches geology.

At Parkdale Senior High, Mr. Anderson was a member of the National Honor Society and of the varisity soccer and wrestling teams. He also played football and soccer in a local boys club.

In addition to his grandfather and sister, Mr. Anderson's survivors include his parents, Martin and Hattie Anderson, and a brother, Hassell Anderson, all of Greenbelt.

The family suggests that expressions of sympathy be in the form of contributions to a scholarship fund being established in his memory at the University of New Brunswick, c/o Mr. and Mrs. Martin, 1-H Gardenway, Greenbelt, Md. 20770.