When I was very small, I used to watch Doctor Who. Tom Baker played the Doctor, Ian Marter played Harry, and Elisabeth Sladen played Sarah Jane Smith, who was kind of like all your nice primary school teachers rolled into one. After a while Ms Sladen left Dr Who, but she went on to appear on a TV programme for small people called Stepping Stones. After a while she stopped appearing on that as well and largely disappeared from the television. Some years later she showed up in a not-very-good Dr Who spin-off called K9 and Company, before returning to make occasional appearances on non-canonical nu-Dr Who.
Ian Marter died some years ago. And today I read that Elisabeth Sladen too has died, aged 63. Here is her last appearance on Doctor Who.