CBS (CBS) - Get Report  'Evening News' lead anchor Scott Pelley will soon no longer head the nightly news show, according to multiple media reports, a position he has held since he took over for Katie Couric in 2011. Pelley will return to the network's weekly news magazine show '60 Minutes.'

Sources told CNN that Pelley will continue to anchor the nightly program indefinitely before making the official move to 60 Minutes. Pelley reportedly had his nightly news office cleared out on Tuesday while he was still on assignment for 60 Minutes

CBS News Senior National Correspondent Anthony Mason will reportedly take over as the nightly news' lead anchor until a permanent replacement is announced. 

CBS shares were down nearly 1% in morning trading Tuesday. 

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