This informative essay on protest and graffiti art in Egypt deserves your attention. The focus is "Ganzeer" (Muhammad Fahmy), one of scores of young artists whose graphics infuriate Field Marshal al-Sisi and his humorless acolytes.
Ganzeer notes that Hisham Rizk, a 19-year old artist, died from drowning in the Nile earlier this month. I suspect that it was an "assisted" drowning. Rizk worked on the opposition website yanayer.