The photo of Gary Morrison in the 1977 yearbook is Gary Wayne Morrison, Not Gary Duane Morrison.  Gary Duane does appear as a Freshman in the 1974 Roar.
Info from Cindy Stevens, RLT 1977

MORRISON
Gary D., of Carrollton, TX. Survived by parents, Mr. & Mrs. J. D. Morrison; grandmother, Mrs. Ola Loyd; grandfather, Mr. D. A. Morrison, and other relatives. Gary was a graduate of R. L. Turner High School in Carrollton; attended Brookhaven Community College. Services, 4:00 p.m. Saturday, RESTLAND MEMORIAL Chapel, Rev. Charles Loyd officiating. Interment, Restland Memorial Park. Pallbearers; Danny Houser, Kenneth Welch, Randy Woody, Brad Lucas, Brett Bailey, Jay Guerin. Honorary pallbearers: Joe Robinson, David Guerin. Family will receive friends and relatives at Restland Funeral Home 7-9 p.m. Friday.
RESTLAND, Greenville Ave at Restland Rd.

The Dallas Morning News - Friday November 9, 1984 Page 13E
Submitted by Edward Lynn Williams

GARY D. MORRISON
1958 - 1984

Restland Memorial Park, Dallas, Dallas County, Texas
Trinity - Space 1; 241 C