He had a bastard daughter, Marjorie, who married Sir Alan Durward, Justiciar of Scotia (he died 1275), and had issue.
He sanctioned Alan Durward's endowment of a chaplaincy of "Logydurnach" (Logie-durno) in 1251, and was alleged have sanctioned a constitution for his diocese.
He took a prominent role as a supporter of Alan Durward during the minority of Alexander III of Scotland, and appears to have lost the Chancellorship as result.
Walter was one of the leading political figures in the Kingdom of Scotland, especially during the minority of King Alexander III, when, along with Alan Durward, he essentially ran the country.
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Brechin fought in the Earl of Surrey's army at the Battle of Dunbar, and was granted lands previously owned by Alan Durward.