|Born|| ca. 1893|
|Cause of death||Shot by police|
|Date|| April 1941|
|Location(s)||Bahía Blanca, Argentina|
Rivas, who was armed with a dagger, first killed his wife and then chased his 17-year-old daughter, who sought refuge with a 60-year-old man named Giovanni Borrego. He killed Borrego and wounded Borrego's wife, who later died in hospital, and subsequently entered the store of Giuseppe Gonzales, whom he injured during a scuffle.
The 47-year-old afterwards boarded a bus where he fatally stabbed Andreina Fernandez, and seriously wounded Raffaele Saravia, and then stepped out into the street and killed a girl named Olga Balla. Finally he entered a house in Calle Donada, where he was confronted by Luis Garcia, who knocked him down with a punch in the face and disarmed him, but Rivas sprang up again, drew another knife from his clothes, and killed the young man's father Eugenio. By that time policeman Domingo Lazaro arrived at the scene and killed Rivas with two revolver shots.
- Mrs. Rivas, his wife
- Olga Balla
- Giovanni Borrego, 60
- Mrs. Borrego, Giovanni Borrego's wife
- Andreina Fernandez
- Eugenio Garcia, 35
Those wounded were Giuseppe Gonzales, and Raffaele Saravia, 30.