Murphy was set to serve a four-game suspension at the beginning of the regular season after violating the NFL's drug abuse policy in the offseason.
The Redskins wanted to be creative with their outside linebackers, with both Smith and Murphy capable of playing inside in certain packages - as they did on occasion in 2016.
USA stocks snap 3-day losing streak in roller coaster week
Investors bought safe-haven assets such as gold , helping the precious metal touch a two-month high, and the Japanese Yen rose. Domino's Pizza also fell after the takeaway firm agreed a partnership with its London franchise business.
Murphy fell and twisted his left knee awkwardly in the first quarter of the team's preseason game against the Ravens Thursday night.
"It's too bad", coach Jay Gruden said before practice Saturday.
It's an unfortunate blow for Murphy, who is coming off the best season of his career, during which he recorded nine sacks and 55 quarterback pressures (sacks plus hits plus hurries).
MLB Trade Rumors: Brewers reportedly close to adding Mets infielder Neil Walker
His salary this season is $17.2 million, of which the Brewers would appear to be responsible for about the remaining $4.7 million. Overall though, Walker has actually had a decent second year in Queens, so the Brewers will be picking a very talented infielder.
Washington also waived tackle Kevin Bowen who was designated as injured. He played two seasons with UAB, recording 40 receptions for 648 yards and five touchdowns.
Following the 2014 season, Staples transferred to Louisville after it was announced that UAB's football program was being shut down. In two seasons with the Cardinals, he had 73 receptions for 1,253 yards and five touchdowns.
TSX falls as North Korea tensions spur flight to safety
The CBOE Volatility Index, a barometer of expected near-term stock market volatility, closed at its highest since the election. South Korea 's fell 1.7 percent to its lowest since May 24, but its losses for the week are a relatively modest 3.2 percent.