He was best known for his strong and rather harsh commentaries on Chilean football players, coaches and managerial structures. Bonvallet had put himself forward repeatedly for the position of coach for the national team Bonvallet had experience training university-level teams, such as Universidad Gabriela Mistral.
He played for local giants Universidad de Chile and Universidad Católica and had spells in the NASL with Tampa Bay Rowdies and Fort Lauderdale Strikers.
Bonvallet made his international debut in 1979, earning a total of 24 caps, but no scoring. In 2007, Bonvallet was appointed manager of Deportivo Temuco (owned by Nehuen Société Anonyme).
The club was in difficulties, losing many games before Bonvallet took charge. This was his first chance to manage a professional team in the second division but success eluded him, Temuco being relegated to the Chilean third division.
Bonvallet had also coined a lot of insulting words and phrases in Chilean Spanish, which became popular on his show TVO Channel thanks to the involuntary aid of another one, Caiga Quién Caiga.
Some of his notorious phrases were:
¡Avíspate re-huevón! (React, dumbass!)
¡Desconchetumadrízate! (Un-motherfucker-ize yourself!)
¡Ahuevonado al máximo! (Dumbass to the max!)
¡Feo, mamónew york no sabís nada! (Ugly! Pussy! And you don"t know anything!)
¡Grita huevón, grita! (Scream idiot! Scream!)
¡O eres monje, fakir o guerrero, o sencillamente te pierdes! (You must be either a monk, a fakir or a warrior or you will simply get lost!)
¡Tienen que comer carne! (They have to eat meat!)
He was on trial several times for publicly insulting managers, politicians, businessmen, et cetera During his last years he earned considerable support, proclaiming himself "El gurú" ("The Guru"). In June 2008, it was reported that there was a physical altercation between Bonvallet and former Chilean football player Carlos Caszely.
The location was a Santiago, Chile ice cream shop located in the commune of Las Condes.
Witnesses reported that there was a fist fight after the two had an exchange of words. In 2011, Bonvallet was diagnosed with stomach cancer.
However, in late 2012 he announced he had beaten the illness but was required to undergo chemotherapy for at least another year. On September 18, 2015, Bonvallet was found dead by hanging using a belt at Nogales Hotel in the kitchen of room 213.
Local news report he was suffering from depression.