Russias most prolific
Siberian ex-policeman Mikhail Popkov was found guilty in December 2018, at the age of 54, of 56 murders. He was already in jail for 22 killings.
Between 1992 and 2007, he raped and killed women with an axe or hammer after offering them late-night rides, sometimes in his police car. He also killed a male policeman.
He is Russias worst serial killer of recent times.
Alexander Pichushkin was sentenced to life in prison in Moscow in 2007 for 48 murders, most between 2002 and 2006.
Aged 33 at his trial, Pichushkin said he wanted to kill one person for each of the 64 squares on a chessboard, and crossed out a square for every kill, hence his nickname.
His victims were mainly elderly alcoholic men he met in a park
Yang Xinhai was executed in China in 2004, aged 35, after murdering 67 people in a three-year rampage that ended with his capture in 2003. Characterised as an introverted drifter, he bicycled from one murder scene to the next, entering homes in rural areas and often slaughtering entire families using an axe, hammer or spade. Police listed robbery and rape as motives but Yang was also described as a deranged killer who simply enjoyed what he was doing
Butcher of Rostov
In 1992 Russian Andrei Chikatilo, 56, was sentenced to death for 52 sexually motivated killings of women, children and young people between 1978 and 1990.
The former teacher, known as the Butcher of Rostov after the area in southern Russia where he was particularly active, was executed in 1994
Monster of the Andes
In 1980 Colombian Pedro Lopez Monsalve was arrested at a market in Ecuador after attempting to abduct a young girl. He later confessed to having strangled at least 310 children from poor backgrounds in Colombia, Ecuador and Peru.
Initially accused of rape and murder of four children, the Monster of the Andes led police to a field where the bodies of 53 young girls were buried.
He was sentenced to 16 years in prison, the maximum term in Ecuador, and extradited in 1994 to Colombia where he was interned in a psychiatric hospital.
Freed several years later, he disappeared and would today be aged around 70
Para asesinos nada tiene que ver que seas de primero o segundo o tercer o cuarto mundo...En todos lados donde hay minorias estas son pisoteadas, asesinadas, exterminadas...preguntenle a los tibetanos, a los armenios, a los kurdos que gaseo Sadam Hussein, en fin...la propaganda anti imperialista que odia a EEUU ha trabajado tanto que creemos que son locos por ser gringos y se nos olvida las barbaridades que todos hacen en todos los paises...los medios comprados lo esconden. Pero no era el tema del debate. EstÃ muy guapa la profesora, es su cuerpo y que haga de su trasero una cometa....