http://en.wikipedia.org/wiki/Richard_Lyons_Otway_Pearson

Lieutenant-Colonel Richard Lyons Otway Pearson CB (1831–30 May 1890) was Assistant Commissioner (Executive) of the London Metropolitan Police from 1881 to 1890.

Pearson was the son of Henry Shepherd Pearson and Caroline Lyons. He was educated at Eton College and the Royal Military College, Sandhurst. He was commissioned into the Grenadier Guards. During the Crimean War (1854–1855), he served as ADC to General Sir George Brown, and was present at Alma, Inkerman and Sebastopol.

In 1856, Pearson married Laura Elizabeth Frederica Markham. They had two sons: Charles Lyons Markham Pearson and Richard Frederick Sydney Pearson

Pearson retired from the army in 1864 with the rank of Lieutenant-Colonel. In 1881 he was appointed Assistant Commissioner of the Metropolitan Police. In June 1887, he was made a Companion of the Bath (CB). He was also a Justice of the Peace for Middlesex. He died after a prolonged illness while still serving.