just remember light twin drivers...either be sharp, or fly singles.
lose an engine and your are flying a crippled plane, get even close to Vmca and you will die. if you go below Vmca, or otherwise lose directional control, you MUST reduce power on the good engine and lower the nose and regain speed and THEN and only THEN can you add more power from the good engine.
Be especially alert inthe enroute and descent phase. We spend so much time at the moment of takeoff engine failure practice that we rarely examine the time enroute or in descent.
very sorry to hear bout this tragedy.