Deathwatch (Laurel Leaf Books)

Blurb

Deathwatch is an American 1972 novel written by Robb White. The book was awarded the 1973 Edgar Award for Best Juvenile Mystery from the Mystery Writers of America.
Its plot features a skilled and successful hunter and lawyer, Madec, who receives a rare permit to shoot bighorn sheep in California's Mojave Desert for seven days. He hires a timid college student named Ben as a guide. After Madec shoots an old prospector, he realizes that Ben will not help cover up the shooting, and he attempts to silence Ben forever.