Pesquet was born in 1922. In 1941, aged nineteen, in German-occupied France, he killed his closest friend, Julien Quivel. He was convicted and served a long sentence.
Between 1974 and 1976, living near Rouen and in Paris, he killed his wife Christiane Ruaux and four elderly people: Henri Francqui, sixty-eight; Emile Bergaud, seventy-three, and his wife Elizia; and another. The motive in each case was money: savings, property, pensions he continued to collect. He concealed several of the bodies by encasing them in cement in the staircase and cellar of his house, which is how they were eventually found. Their maid, Alfia Borgioni, died with them.
He gave an account of the deaths that the investigating authorities did not accept, and he was tried and sentenced to life imprisonment on October 8, 1982.
The accessible sourcing is French press material and summary entries; the individual deaths are not documented in detail in anything available here. What is clear from the record is the shape: a killing at nineteen, a sentence served, and a second series beginning more than three decades later against victims chosen for what they had.