I have to admit I don't know much about the Maloneys. I can't recall that anyone spoke about them. I only heard of the name when I started on the Trait history, about 30-35 years ago.
I have noted, on a written Trait pedigree, the first generation born in Australia:
Bridget Trait 1831-1890 (or 1909) mar (1) 1852 Martin Maloney 1828-1868, (2) 1870 John Robinson.
Nine Maloney births:
Mary Anne 1852-1941 mar. Wm Gleeson, Martin 1855-1928, Michael 1856-1902, Margt. 1857-1895, Thomas 1858, John 1858-1923 mar. Cath Steele, Bridget 1861, Edw. 1863-1932, Daniel 1867-68
I didn't know that Michael married Margt Daly. I have heard of the Gleesons, but I can't find anything just now. I have a few sources to look up, but, as I said, I have never done extensive research on the Maloneys. To find out the cause of death you would have to get their Death Certs. from the Victorian Reg. of BDM , Melbourne. They cost at least $25 each. Or you could try online. Google in "BDM Vic".
I suggest you look up a free site for old newspapers, called TROVE. It contains papers from Aust & NZ and you find court cases, some BD & M, accidents, crimes etc. I had a quick look for your Patk Edw.but found nothing. Just google in "trove newspapers".
Anyway, I'll go through what I've got and let you know if I turn up anything relevant.
Ken