Buenaventura Nepomuceno Matallana was a Colombian criminal, murderer, and suspected serial killer. He was tried and sentenced to 24 years imprisonment for the 1949 murder of merchant Alfredo Forero Vanegas, and he was also suspected to be responsible for the disappearances of at least six or seven others to whom he pretended to be a lawyer, signing broad powers over his properties under the pretext of a big business, after which the clients either disappeared or were found dead.