Sorry to hear about your lost. Indeed death is a inescapable thing. As a Muslim I believe that believe this present life is only a trial preparation for the next realm of existence. It is merely a test and with it trails and test come a forth.
As a Muslim, I know that everyone will one day die and no-one will be left on earth.
"Every soul shall have a taste of death" (al-Imran 3:185)”
There is no escape from death. Allah (SW) says:
"Wherever you are, death will find you out. Even if you are in towers built up strong and high." (al-Nisaa 4:78)
As a Muslim I know that I will return to Allah (God) one day and be accountable for my deeds.
"We did create man from a quintessence of clay; Then We placed him as a drop of sperm in a place of rest firmly fixed then We made the sperm into a clot of congealed blood; Then of that clot We made a lump; Then We made out of the lump bones and clothed the bones with flesh then We developed out of it another creature. So blessed be Allah the best to create after that, you will die. On the day of judgement you will be raised up again." (al-Muuminun 23:12-16)
"Life is nothing other than a road,
that leads to the Garden,
or to the Fire.
Its night's are a man's workshop,
And its days are his market place,
So time is surely the servants capital."
Knowing that whoever die’s belongs to Allah and He (Allah) has more right over His slave and takes him/her back when he please, I got to be patient. I have to come into terms with the realities of death.
Once one understands the whole concept of death. There’s nothing left to do but be patience and get on with life. And reflect on the life to come. And work to be a good Muslim. Also as a Muslim i look at the reward Allah has in store for me for been patient.
“Surely, Allaah is with those who are As‑Saabiroon (the patient)”
[al-Anfaal 6:46]
“But if you endure patiently, verily, it is better for As‑Saabiroon (the patient)”
[al-Nahl 16:126]
“But if you remain patient and become Al-Muttaqoon (the pious), not the least harm will their cunning do to you. Surely, Allaah surrounds all that they do”
[Aal ‘Imraan 3:120]
“but give glad tidings to As‑ Saabiroon (the patient).
156. Who, when afflicted with calamity, say: ‘Truly, to Allaah we belong and truly, to Him we shall return.’
157. They are those on whom are the Salawaat (i.e. who are blessed and will be forgiven) from their Lord, and (they are those who) receive His Mercy, and it is they who are the guided ones”
[al-Baqarah 2:155-157]