A couple arrested on suspicion of fatally poisoning their 4-year-old daughter were served fresh warrants by Tokyo police on Wednesday for allegedly killing the husband's 41-year-old sister six years ago in a similar way, investigative sources said.Kenichi Hosoya, 43, and his wife Shiho Hosoya, 37, are suspected of murdering his elder sister Minako Hosoya around April 29, 2018, by poisoning her with ethylene glycol, a toxic substance found in antifreeze.Kenichi Hosoya was described by investigators as saying he "cannot say anything right now" about the new allegation while Shiho Hosoya was s…READ FULL ARTICLE