A journalist and philosophy student, the 27-year-old had recently received threats and attacks on social media. He was a contributor to several left-wing and independent media outlets.
"It's strange that Martín has left without notifying anyone. He's an adult but he always sent me messages to make sure I was at ease about what time he was coming home", his mother Mónica Ibáñez told reporters.
Licata had allegedly also been beaten by police two months ago in the street.