Grieving a lost of a parent

Has anyone on here lost a parent? I mean obviously, but like how did you cope? I recently have lost my dad. Just a few days ago and I’m crushed. He wasn’t the worlds best dad, he wasn’t in my life but he called and tried to build a relationship with me. He did drugs but he promised me two weeks ago he wouldn’t die from drugs. He didn’t, he was murdered which makes my grief even harder. My mom has always been an alcoholic and even though they were together, her drink has gotten so much worst, she now starts at 7am. The last time I spoke to him was Friday night and he’s last words was he loved me. I’m so hurt.

Any advice, any encouragement, I’m going through it hard.